VarHandle (Java SE 9 & JDK 9 ) (original) (raw)

public abstract class VarHandle
extends Object
A VarHandle is a dynamically strongly typed reference to a variable, or to a parametrically-defined family of variables, including static fields, non-static fields, array elements, or components of an off-heap data structure. Access to such variables is supported under various_access modes_, including plain read/write access, volatile read/write access, and compare-and-swap.
VarHandles are immutable and have no visible state. VarHandles cannot be subclassed by the user.
A VarHandle has:

a variable type T, the type of every variable referenced by this VarHandle; and
a list of coordinate types CT1, CT2, ..., CTn, the types of coordinate expressions that jointly locate a variable referenced by this VarHandle.
Variable and coordinate types may be primitive or reference, and are represented by Class objects. The list of coordinate types may be empty.
Factory methods that produce or lookup VarHandle instances document the supported variable type and the list of coordinate types.
Each access mode is associated with one access mode method, asignature polymorphic method named for the access mode. When an access mode method is invoked on a VarHandle instance, the initial arguments to the invocation are coordinate expressions that indicate in precisely which object the variable is to be accessed. Trailing arguments to the invocation represent values of importance to the access mode. For example, the various compare-and-set or compare-and-exchange access modes require two trailing arguments for the variable's expected value and new value.
The arity and types of arguments to the invocation of an access mode method are not checked statically. Instead, each access mode method specifies an access mode type, represented as an instance of MethodType, that serves as a kind of method signature against which the arguments are checked dynamically. An access mode type gives formal parameter types in terms of the coordinate types of a VarHandle instance and the types for values of importance to the access mode. An access mode type also gives a return type, often in terms of the variable type of a VarHandle instance. When an access mode method is invoked on a VarHandle instance, the symbolic type descriptor at the call site, the run time types of arguments to the invocation, and the run time type of the return value, must match the types given in the access mode type. A runtime exception will be thrown if the match fails. For example, the access mode method compareAndSet(java.lang.Object...) specifies that if its receiver is a VarHandle instance with coordinate typesCT1, ..., CTn and variable type T, then its access mode type is (CT1 c1, ..., CTn cn, T expectedValue, T newValue)boolean. Suppose that a VarHandle instance can access array elements, and that its coordinate types are String[] and int while its variable type is String. The access mode type for compareAndSet on this VarHandle instance would be(String[] c1, int c2, String expectedValue, String newValue)boolean. Such a VarHandle instance may produced by thearray factory method and access array elements as follows:
String[] sa = ... VarHandle avh = MethodHandles.arrayElementVarHandle(String[].class); boolean r = avh.compareAndSet(sa, 10, "expected", "new");
Access modes control atomicity and consistency properties.Plain read (get) and write (set) accesses are guaranteed to be bitwise atomic only for references and for primitive values of at most 32 bits, and impose no observable ordering constraints with respect to threads other than the executing thread. Opaque operations are bitwise atomic and coherently ordered with respect to accesses to the same variable. In addition to obeying Opaque properties, Acquire mode reads and their subsequent accesses are ordered after matching_Release_ mode writes and their previous accesses. In addition to obeying Acquire and Release properties, all_Volatile_ operations are totally ordered with respect to each other.
Access modes are grouped into the following categories:
read access modes that get the value of a variable under specified memory ordering effects. The set of corresponding access mode methods belonging to this group consists of the methodsget,getVolatile,getAcquire,getOpaque.
write access modes that set the value of a variable under specified memory ordering effects. The set of corresponding access mode methods belonging to this group consists of the methodsset,setVolatile,setRelease,setOpaque.
atomic update access modes that, for example, atomically compare and set the value of a variable under specified memory ordering effects. The set of corresponding access mode methods belonging to this group consists of the methodscompareAndSet,weakCompareAndSetPlain,weakCompareAndSet,weakCompareAndSetAcquire,weakCompareAndSetRelease,compareAndExchangeAcquire,compareAndExchange,compareAndExchangeRelease,getAndSet,getAndSetAcquire,getAndSetRelease.
numeric atomic update access modes that, for example, atomically get and set with addition the value of a variable under specified memory ordering effects. The set of corresponding access mode methods belonging to this group consists of the methodsgetAndAdd,getAndAddAcquire,getAndAddRelease,
bitwise atomic update access modes that, for example, atomically get and bitwise OR the value of a variable under specified memory ordering effects. The set of corresponding access mode methods belonging to this group consists of the methodsgetAndBitwiseOr,getAndBitwiseOrAcquire,getAndBitwiseOrRelease,getAndBitwiseAnd,getAndBitwiseAndAcquire,getAndBitwiseAndRelease,getAndBitwiseXor,getAndBitwiseXorAcquire,getAndBitwiseXorRelease.
Factory methods that produce or lookup VarHandle instances document the set of access modes that are supported, which may also include documenting restrictions based on the variable type and whether a variable is read-only. If an access mode is not supported then the corresponding access mode method will on invocation throw an UnsupportedOperationException. Factory methods should document any additional undeclared exceptions that may be thrown by access mode methods. The get access mode is supported for all VarHandle instances and the corresponding method never throwsUnsupportedOperationException. If a VarHandle references a read-only variable (for example a final field) then write, atomic update, numeric atomic update, and bitwise atomic update access modes are not supported and corresponding methods throwUnsupportedOperationException. Read/write access modes (if supported), with the exception ofget and set, provide atomic access for reference types and all primitive types. Unless stated otherwise in the documentation of a factory method, the access modes get and set (if supported) provide atomic access for reference types and all primitives types, with the exception of long and double on 32-bit platforms.
Access modes will override any memory ordering effects specified at the declaration site of a variable. For example, a VarHandle accessing a a field using the get access mode will access the field as specified by its access mode even if that field is declaredvolatile. When mixed access is performed extreme care should be taken since the Java Memory Model may permit surprising results.
In addition to supporting access to variables under various access modes, a set of static methods, referred to as memory fence methods, is also provided for fine-grained control of memory ordering. The Java Language Specification permits other threads to observe operations as if they were executed in orders different than are apparent in program source code, subject to constraints arising, for example, from the use of locks, volatile fields or VarHandles. The static methods,fullFence, acquireFence,releaseFence, loadLoadFence andstoreStoreFence, can also be used to impose constraints. Their specifications, as is the case for certain access modes, are phrased in terms of the lack of "reorderings" -- observable ordering effects that might otherwise occur if the fence was not present. More precise phrasing of the specification of access mode methods and memory fence methods may accompany future updates of the Java Language Specification.

Compiling invocation of access mode methods

A Java method call expression naming an access mode method can invoke a VarHandle from Java source code. From the viewpoint of source code, these methods can take any arguments and their polymorphic result (if expressed) can be cast to any return type. Formally this is accomplished by giving the access mode methods variable arity Object arguments andObject return types (if the return type is polymorphic), but they have an additional quality called signature polymorphism which connects this freedom of invocation directly to the JVM execution stack.
As is usual with virtual methods, source-level calls to access mode methods compile to an invokevirtual instruction. More unusually, the compiler must record the actual argument types, and may not perform method invocation conversions on the arguments. Instead, it must generate instructions to push them on the stack according to their own unconverted types. The VarHandle object itself will be pushed on the stack before the arguments. The compiler then generates an invokevirtual instruction that invokes the access mode method with a symbolic type descriptor which describes the argument and return types.
To issue a complete symbolic type descriptor, the compiler must also determine the return type (if polymorphic). This is based on a cast on the method invocation expression, if there is one, or else Object if the invocation is an expression, or else void if the invocation is a statement. The cast may be to a primitive type (but not void).
As a corner case, an uncasted null argument is given a symbolic type descriptor of java.lang.Void. The ambiguity with the typeVoid is harmless, since there are no references of type Void except the null reference.

Performing invocation of access mode methods

The first time an invokevirtual instruction is executed it is linked by symbolically resolving the names in the instruction and verifying that the method call is statically legal. This also holds for calls to access mode methods. In this case, the symbolic type descriptor emitted by the compiler is checked for correct syntax, and names it contains are resolved. Thus, aninvokevirtual instruction which invokes an access mode method will always link, as long as the symbolic type descriptor is syntactically well-formed and the types exist.
When the invokevirtual is executed after linking, the receiving VarHandle's access mode type is first checked by the JVM to ensure that it matches the symbolic type descriptor. If the type match fails, it means that the access mode method which the caller is invoking is not present on the individual VarHandle being invoked.
Invocation of an access mode method behaves as if an invocation ofMethodHandle.invoke(java.lang.Object...), where the receiving method handle accepts the VarHandle instance as the leading argument. More specifically, the following, where {access-mode} corresponds to the access mode method name:
VarHandle vh = .. R r = (R) vh.{access-mode}(p1, p2, ..., pN);
behaves as if:
VarHandle vh = .. VarHandle.AccessMode am = VarHandle.AccessMode.valueFromMethodName("{access-mode}"); MethodHandle mh = MethodHandles.varHandleExactInvoker( am, vh.accessModeType(am)); R r = (R) mh.invoke(vh, p1, p2, ..., pN)
(modulo access mode methods do not declare throwing of Throwable). This is equivalent to:
MethodHandle mh = MethodHandles.lookup().findVirtual( VarHandle.class, "{access-mode}", MethodType.methodType(R, p1, p2, ..., pN)); R r = (R) mh.invokeExact(vh, p1, p2, ..., pN)
where the desired method type is the symbolic type descriptor and aMethodHandle.invokeExact(java.lang.Object...) is performed, since before invocation of the target, the handle will apply reference casts as necessary and box, unbox, or widen primitive values, as if by asType (see alsoMethodHandles.varHandleInvoker(java.lang.invoke.VarHandle.AccessMode, java.lang.invoke.MethodType)). More concisely, such behaviour is equivalent to:
VarHandle vh = .. VarHandle.AccessMode am = VarHandle.AccessMode.valueFromMethodName("{access-mode}"); MethodHandle mh = vh.toMethodHandle(am); R r = (R) mh.invoke(p1, p2, ..., pN)
Where, in this case, the method handle is bound to the VarHandle instance.

Invocation checking

In typical programs, VarHandle access mode type matching will usually succeed. But if a match fails, the JVM will throw aWrongMethodTypeException.
Thus, an access mode type mismatch which might show up as a linkage error in a statically typed program can show up as a dynamicWrongMethodTypeException in a program which uses VarHandles.
Because access mode types contain "live" Class objects, method type matching takes into account both type names and class loaders. Thus, even if a VarHandle VH is created in one class loaderL1 and used in another L2, VarHandle access mode method calls are type-safe, because the caller's symbolic type descriptor, as resolved in L2, is matched against the original callee method's symbolic type descriptor, as resolved in L1. The resolution inL1 happens when VH is created and its access mode types are assigned, while the resolution in L2 happens when theinvokevirtual instruction is linked.
Apart from type descriptor checks, a VarHandles's capability to access it's variables is unrestricted. If a VarHandle is formed on a non-public variable by a class that has access to that variable, the resulting VarHandle can be used in any place by any caller who receives a reference to it.
Unlike with the Core Reflection API, where access is checked every time a reflective method is invoked, VarHandle access checking is performedwhen the VarHandle is created. Thus, VarHandles to non-public variables, or to variables in non-public classes, should generally be kept secret. They should not be passed to untrusted code unless their use from the untrusted code would be harmless.

VarHandle creation

Java code can create a VarHandle that directly accesses any field that is accessible to that code. This is done via a reflective, capability-based API called MethodHandles.Lookup. For example, a VarHandle for a non-static field can be obtained from Lookup.findVarHandle. There is also a conversion method from Core Reflection API objects,Lookup.unreflectVarHandle.
Access to protected field members is restricted to receivers only of the accessing class, or one of its subclasses, and the accessing class must in turn be a subclass (or package sibling) of the protected member's defining class. If a VarHandle refers to a protected non-static field of a declaring class outside the current package, the receiver argument will be narrowed to the type of the accessing class.

Interoperation between VarHandles and the Core Reflection API

Using factory methods in the Lookup API, any field represented by a Core Reflection API object can be converted to a behaviorally equivalent VarHandle. For example, a reflective Field can be converted to a VarHandle usingLookup.unreflectVarHandle. The resulting VarHandles generally provide more direct and efficient access to the underlying fields.
As a special case, when the Core Reflection API is used to view the signature polymorphic access mode methods in this class, they appear as ordinary non-polymorphic methods. Their reflective appearance, as viewed byClass.getDeclaredMethod, is unaffected by their special status in this API. For example, Method.getModifiers will report exactly those modifier bits required for any similarly declared method, including in this case native and varargs bits.
As with any reflected method, these methods (when reflected) may be invoked directly via java.lang.reflect.Method.invoke, via JNI, or indirectly viaLookup.unreflect. However, such reflective calls do not result in access mode method invocations. Such a call, if passed the required argument (a single one, of type Object[]), will ignore the argument and will throw anUnsupportedOperationException.
Since invokevirtual instructions can natively invoke VarHandle access mode methods under any symbolic type descriptor, this reflective view conflicts with the normal presentation of these methods via bytecodes. Thus, these native methods, when reflectively viewed byClass.getDeclaredMethod, may be regarded as placeholders only.
In order to obtain an invoker method for a particular access mode type, use MethodHandles.varHandleExactInvoker(java.lang.invoke.VarHandle.AccessMode, java.lang.invoke.MethodType) orMethodHandles.varHandleInvoker(java.lang.invoke.VarHandle.AccessMode, java.lang.invoke.MethodType). TheLookup.findVirtual API is also able to return a method handle to call an access mode method for any specified access mode type and is equivalent in behaviour toMethodHandles.varHandleInvoker(java.lang.invoke.VarHandle.AccessMode, java.lang.invoke.MethodType).

Interoperation between VarHandles and Java generics

A VarHandle can be obtained for a variable, such as a a field, which is declared with Java generic types. As with the Core Reflection API, the VarHandle's variable type will be constructed from the erasure of the source-level type. When a VarHandle access mode method is invoked, the types of its arguments or the return value cast type may be generic types or type instances. If this occurs, the compiler will replace those types by their erasures when it constructs the symbolic type descriptor for theinvokevirtual instruction.
Since:
9
See Also:
MethodHandle, MethodHandles, MethodType

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	VarHandle.AccessMode	The set of access modes that specify how a variable, referenced by a VarHandle, is accessed.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods

Modifier and Type	Method	Description
MethodType	accessModeType(VarHandle.AccessMode accessMode)	Obtains the access mode type for this VarHandle and a given access mode.
static void	acquireFence()	Ensures that loads before the fence will not be reordered with loads and stores after the fence.
Object	compareAndExchange(Object... args)	Atomically sets the value of a variable to the newValue with the memory semantics of setVolatile(java.lang.Object...) if the variable's current value, referred to as the witness value, == theexpectedValue, as accessed with the memory semantics ofgetVolatile(java.lang.Object...).
Object	compareAndExchangeAcquire(Object... args)	Atomically sets the value of a variable to the newValue with the memory semantics of set(java.lang.Object...) if the variable's current value, referred to as the witness value, == theexpectedValue, as accessed with the memory semantics ofgetAcquire(java.lang.Object...).
Object	compareAndExchangeRelease(Object... args)	Atomically sets the value of a variable to the newValue with the memory semantics of setRelease(java.lang.Object...) if the variable's current value, referred to as the witness value, == theexpectedValue, as accessed with the memory semantics ofget(java.lang.Object...).
boolean	compareAndSet(Object... args)	Atomically sets the value of a variable to the newValue with the memory semantics of setVolatile(java.lang.Object...) if the variable's current value, referred to as the witness value, == theexpectedValue, as accessed with the memory semantics ofgetVolatile(java.lang.Object...).
List<Class<?>>	coordinateTypes()	Returns the coordinate types for this VarHandle.
static void	fullFence()	Ensures that loads and stores before the fence will not be reordered with loads and stores after the fence.
Object	get(Object... args)	Returns the value of a variable, with memory semantics of reading as if the variable was declared non-volatile.
Object	getAcquire(Object... args)	Returns the value of a variable, and ensures that subsequent loads and stores are not reordered before this access.
Object	getAndAdd(Object... args)	Atomically adds the value to the current value of a variable with the memory semantics of setVolatile(java.lang.Object...), and returns the variable's previous value, as accessed with the memory semantics ofgetVolatile(java.lang.Object...).
Object	getAndAddAcquire(Object... args)	Atomically adds the value to the current value of a variable with the memory semantics of set(java.lang.Object...), and returns the variable's previous value, as accessed with the memory semantics ofgetAcquire(java.lang.Object...).
Object	getAndAddRelease(Object... args)	Atomically adds the value to the current value of a variable with the memory semantics of setRelease(java.lang.Object...), and returns the variable's previous value, as accessed with the memory semantics ofget(java.lang.Object...).
Object	getAndBitwiseAnd(Object... args)	Atomically sets the value of a variable to the result of bitwise AND between the variable's current value and the mask with the memory semantics of setVolatile(java.lang.Object...) and returns the variable's previous value, as accessed with the memory semantics ofgetVolatile(java.lang.Object...).
Object	getAndBitwiseAndAcquire(Object... args)	Atomically sets the value of a variable to the result of bitwise AND between the variable's current value and the mask with the memory semantics of set(java.lang.Object...) and returns the variable's previous value, as accessed with the memory semantics ofgetAcquire(java.lang.Object...).
Object	getAndBitwiseAndRelease(Object... args)	Atomically sets the value of a variable to the result of bitwise AND between the variable's current value and the mask with the memory semantics of setRelease(java.lang.Object...) and returns the variable's previous value, as accessed with the memory semantics ofget(java.lang.Object...).
Object	getAndBitwiseOr(Object... args)	Atomically sets the value of a variable to the result of bitwise OR between the variable's current value and the mask with the memory semantics of setVolatile(java.lang.Object...) and returns the variable's previous value, as accessed with the memory semantics ofgetVolatile(java.lang.Object...).
Object	getAndBitwiseOrAcquire(Object... args)	Atomically sets the value of a variable to the result of bitwise OR between the variable's current value and the mask with the memory semantics of set(java.lang.Object...) and returns the variable's previous value, as accessed with the memory semantics ofgetAcquire(java.lang.Object...).
Object	getAndBitwiseOrRelease(Object... args)	Atomically sets the value of a variable to the result of bitwise OR between the variable's current value and the mask with the memory semantics of setRelease(java.lang.Object...) and returns the variable's previous value, as accessed with the memory semantics ofget(java.lang.Object...).
Object	getAndBitwiseXor(Object... args)	Atomically sets the value of a variable to the result of bitwise XOR between the variable's current value and the mask with the memory semantics of setVolatile(java.lang.Object...) and returns the variable's previous value, as accessed with the memory semantics ofgetVolatile(java.lang.Object...).
Object	getAndBitwiseXorAcquire(Object... args)	Atomically sets the value of a variable to the result of bitwise XOR between the variable's current value and the mask with the memory semantics of set(java.lang.Object...) and returns the variable's previous value, as accessed with the memory semantics ofgetAcquire(java.lang.Object...).
Object	getAndBitwiseXorRelease(Object... args)	Atomically sets the value of a variable to the result of bitwise XOR between the variable's current value and the mask with the memory semantics of setRelease(java.lang.Object...) and returns the variable's previous value, as accessed with the memory semantics ofget(java.lang.Object...).
Object	getAndSet(Object... args)	Atomically sets the value of a variable to the newValue with the memory semantics of setVolatile(java.lang.Object...) and returns the variable's previous value, as accessed with the memory semantics ofgetVolatile(java.lang.Object...).
Object	getAndSetAcquire(Object... args)	Atomically sets the value of a variable to the newValue with the memory semantics of set(java.lang.Object...) and returns the variable's previous value, as accessed with the memory semantics ofgetAcquire(java.lang.Object...).
Object	getAndSetRelease(Object... args)	Atomically sets the value of a variable to the newValue with the memory semantics of setRelease(java.lang.Object...) and returns the variable's previous value, as accessed with the memory semantics ofget(java.lang.Object...).
Object	getOpaque(Object... args)	Returns the value of a variable, accessed in program order, but with no assurance of memory ordering effects with respect to other threads.
Object	getVolatile(Object... args)	Returns the value of a variable, with memory semantics of reading as if the variable was declared volatile.
boolean	isAccessModeSupported(VarHandle.AccessMode accessMode)	Returns true if the given access mode is supported, otherwisefalse.
static void	loadLoadFence()	Ensures that loads before the fence will not be reordered with loads after the fence.
static void	releaseFence()	Ensures that loads and stores before the fence will not be reordered with stores after the fence.
void	set(Object... args)	Sets the value of a variable to the newValue, with memory semantics of setting as if the variable was declared non-volatile and non-final.
void	setOpaque(Object... args)	Sets the value of a variable to the newValue, in program order, but with no assurance of memory ordering effects with respect to other threads.
void	setRelease(Object... args)	Sets the value of a variable to the newValue, and ensures that prior loads and stores are not reordered after this access.
void	setVolatile(Object... args)	Sets the value of a variable to the newValue, with memory semantics of setting as if the variable was declared volatile.
static void	storeStoreFence()	Ensures that stores before the fence will not be reordered with stores after the fence.
MethodHandle	toMethodHandle(VarHandle.AccessMode accessMode)	Obtains a method handle bound to this VarHandle and the given access mode.
Class<?>	varType()	Returns the variable type of variables referenced by this VarHandle.
boolean	weakCompareAndSet(Object... args)	Possibly atomically sets the value of a variable to the newValue with the memory semantics of setVolatile(java.lang.Object...) if the variable's current value, referred to as the witness value, == theexpectedValue, as accessed with the memory semantics ofgetVolatile(java.lang.Object...).
boolean	weakCompareAndSetAcquire(Object... args)	Possibly atomically sets the value of a variable to the newValue with the semantics of set(java.lang.Object...) if the variable's current value, referred to as the witness value, == theexpectedValue, as accessed with the memory semantics ofgetAcquire(java.lang.Object...).
boolean	weakCompareAndSetPlain(Object... args)	Possibly atomically sets the value of a variable to the newValue with the semantics of set(java.lang.Object...) if the variable's current value, referred to as the witness value, == theexpectedValue, as accessed with the memory semantics ofget(java.lang.Object...).
boolean	weakCompareAndSetRelease(Object... args)	Possibly atomically sets the value of a variable to the newValue with the semantics of setRelease(java.lang.Object...) if the variable's current value, referred to as the witness value, == theexpectedValue, as accessed with the memory semantics ofget(java.lang.Object...).

   * ### Methods inherited from class java.lang.[Object](../../../java/lang/Object.html "class in java.lang")  
   `[clone](../../../java/lang/Object.html#clone--), [equals](../../../java/lang/Object.html#equals-java.lang.Object-), [finalize](../../../java/lang/Object.html#finalize--), [getClass](../../../java/lang/Object.html#getClass--), [hashCode](../../../java/lang/Object.html#hashCode--), [notify](../../../java/lang/Object.html#notify--), [notifyAll](../../../java/lang/Object.html#notifyAll--), [toString](../../../java/lang/Object.html#toString--), [wait](../../../java/lang/Object.html#wait--), [wait](../../../java/lang/Object.html#wait-long-), [wait](../../../java/lang/Object.html#wait-long-int-)`

Method Detail

 * #### get  
 public final [Object](../../../java/lang/Object.html "class in java.lang") get([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Returns the value of a variable, with memory semantics of reading as if the variable was declared non-`volatile`. Commonly referred to as plain read access.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn)T`.  
 The symbolic type descriptor at the call site of `get` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET)` on this VarHandle.  
 This access mode is supported by all VarHandle instances and never throws `UnsupportedOperationException`.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the value of the variable , statically represented using `Object`.  
 Throws:  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 * #### set  
 public final void set([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Sets the value of a variable to the `newValue`, with memory semantics of setting as if the variable was declared non-`volatile` and non-`final`. Commonly referred to as plain write access.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T newValue)void`  
 The symbolic type descriptor at the call site of `set` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.SET)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T newValue)` , statically represented using varargs.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 * #### getVolatile  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getVolatile([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Returns the value of a variable, with memory semantics of reading as if the variable was declared `volatile`.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn)T`.  
 The symbolic type descriptor at the call site of `getVolatile` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_VOLATILE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 * #### setVolatile  
 public final void setVolatile([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Sets the value of a variable to the `newValue`, with memory semantics of setting as if the variable was declared `volatile`.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T newValue)void`.  
 The symbolic type descriptor at the call site of `setVolatile` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.SET_VOLATILE)` on this VarHandle.  
 API Note:  
 Ignoring the many semantic differences from C and C++, this method has memory ordering effects compatible with `memory_order_seq_cst`.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T newValue)` , statically represented using varargs.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 * #### getOpaque  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getOpaque([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Returns the value of a variable, accessed in program order, but with no assurance of memory ordering effects with respect to other threads.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn)T`.  
 The symbolic type descriptor at the call site of `getOpaque` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_OPAQUE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 * #### setOpaque  
 public final void setOpaque([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Sets the value of a variable to the `newValue`, in program order, but with no assurance of memory ordering effects with respect to other threads.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T newValue)void`.  
 The symbolic type descriptor at the call site of `setOpaque` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.SET_OPAQUE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T newValue)` , statically represented using varargs.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 * #### getAcquire  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAcquire([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Returns the value of a variable, and ensures that subsequent loads and stores are not reordered before this access.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn)T`.  
 The symbolic type descriptor at the call site of `getAcquire` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_ACQUIRE)` on this VarHandle.  
 API Note:  
 Ignoring the many semantic differences from C and C++, this method has memory ordering effects compatible with `memory_order_acquire` ordering.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 * #### setRelease  
 public final void setRelease([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Sets the value of a variable to the `newValue`, and ensures that prior loads and stores are not reordered after this access.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T newValue)void`.  
 The symbolic type descriptor at the call site of `setRelease` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.SET_RELEASE)` on this VarHandle.  
 API Note:  
 Ignoring the many semantic differences from C and C++, this method has memory ordering effects compatible with `memory_order_release` ordering.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T newValue)` , statically represented using varargs.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 * #### compareAndSet  
 public final boolean compareAndSet([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the `newValue` with the memory semantics of [setVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-) if the variable's current value, referred to as the _witness value_, `==` the`expectedValue`, as accessed with the memory semantics of[getVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-).  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)boolean`.  
 The symbolic type descriptor at the call site of ` compareAndSet` must match the access mode type that is the result of calling `accessModeType(VarHandle.AccessMode.COMPARE_AND_SET)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)` , statically represented using varargs.  
 Returns:  
 `true` if successful, otherwise `false` if the witness value was not the same as the `expectedValue`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-), [getVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-)  
 * #### compareAndExchange  
 public final [Object](../../../java/lang/Object.html "class in java.lang") compareAndExchange([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the `newValue` with the memory semantics of [setVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-) if the variable's current value, referred to as the _witness value_, `==` the`expectedValue`, as accessed with the memory semantics of[getVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-).  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)T`.  
 The symbolic type descriptor at the call site of ` compareAndExchange` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.COMPARE_AND_EXCHANGE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the witness value, which will be the same as the `expectedValue` if successful , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type is not compatible with the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type is compatible with the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-), [getVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-)  
 * #### compareAndExchangeAcquire  
 public final [Object](../../../java/lang/Object.html "class in java.lang") compareAndExchangeAcquire([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the `newValue` with the memory semantics of [set(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#set-java.lang.Object...-) if the variable's current value, referred to as the _witness value_, `==` the`expectedValue`, as accessed with the memory semantics of[getAcquire(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#getAcquire-java.lang.Object...-).  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)T`.  
 The symbolic type descriptor at the call site of ` compareAndExchangeAcquire` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.COMPARE_AND_EXCHANGE_ACQUIRE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the witness value, which will be the same as the `expectedValue` if successful , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [set(Object...)](../../../java/lang/invoke/VarHandle.html#set-java.lang.Object...-), [getAcquire(Object...)](../../../java/lang/invoke/VarHandle.html#getAcquire-java.lang.Object...-)  
 * #### compareAndExchangeRelease  
 public final [Object](../../../java/lang/Object.html "class in java.lang") compareAndExchangeRelease([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the `newValue` with the memory semantics of [setRelease(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#setRelease-java.lang.Object...-) if the variable's current value, referred to as the _witness value_, `==` the`expectedValue`, as accessed with the memory semantics of[get(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#get-java.lang.Object...-).  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)T`.  
 The symbolic type descriptor at the call site of ` compareAndExchangeRelease` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.COMPARE_AND_EXCHANGE_RELEASE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the witness value, which will be the same as the `expectedValue` if successful , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setRelease(Object...)](../../../java/lang/invoke/VarHandle.html#setRelease-java.lang.Object...-), [get(Object...)](../../../java/lang/invoke/VarHandle.html#get-java.lang.Object...-)  
 * #### weakCompareAndSetPlain  
 public final boolean weakCompareAndSetPlain([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Possibly atomically sets the value of a variable to the `newValue` with the semantics of [set(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#set-java.lang.Object...-) if the variable's current value, referred to as the _witness value_, `==` the`expectedValue`, as accessed with the memory semantics of[get(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#get-java.lang.Object...-).  
 This operation may fail spuriously (typically, due to memory contention) even if the witness value does match the expected value.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)boolean`.  
 The symbolic type descriptor at the call site of ` weakCompareAndSetPlain` must match the access mode type that is the result of calling `accessModeType(VarHandle.AccessMode.WEAK_COMPARE_AND_SET_PLAIN)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)` , statically represented using varargs.  
 Returns:  
 `true` if successful, otherwise `false` if the witness value was not the same as the `expectedValue` or if this operation spuriously failed.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [set(Object...)](../../../java/lang/invoke/VarHandle.html#set-java.lang.Object...-), [get(Object...)](../../../java/lang/invoke/VarHandle.html#get-java.lang.Object...-)  
 * #### weakCompareAndSet  
 public final boolean weakCompareAndSet([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Possibly atomically sets the value of a variable to the `newValue` with the memory semantics of [setVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-) if the variable's current value, referred to as the _witness value_, `==` the`expectedValue`, as accessed with the memory semantics of[getVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-).  
 This operation may fail spuriously (typically, due to memory contention) even if the witness value does match the expected value.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)boolean`.  
 The symbolic type descriptor at the call site of ` weakCompareAndSet` must match the access mode type that is the result of calling `accessModeType(VarHandle.AccessMode.WEAK_COMPARE_AND_SET)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)` , statically represented using varargs.  
 Returns:  
 `true` if successful, otherwise `false` if the witness value was not the same as the `expectedValue` or if this operation spuriously failed.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-), [getVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-)  
 * #### weakCompareAndSetAcquire  
 public final boolean weakCompareAndSetAcquire([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Possibly atomically sets the value of a variable to the `newValue` with the semantics of [set(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#set-java.lang.Object...-) if the variable's current value, referred to as the _witness value_, `==` the`expectedValue`, as accessed with the memory semantics of[getAcquire(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#getAcquire-java.lang.Object...-).  
 This operation may fail spuriously (typically, due to memory contention) even if the witness value does match the expected value.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)boolean`.  
 The symbolic type descriptor at the call site of ` weakCompareAndSetAcquire` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.WEAK_COMPARE_AND_SET_ACQUIRE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)` , statically represented using varargs.  
 Returns:  
 `true` if successful, otherwise `false` if the witness value was not the same as the `expectedValue` or if this operation spuriously failed.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [set(Object...)](../../../java/lang/invoke/VarHandle.html#set-java.lang.Object...-), [getAcquire(Object...)](../../../java/lang/invoke/VarHandle.html#getAcquire-java.lang.Object...-)  
 * #### weakCompareAndSetRelease  
 public final boolean weakCompareAndSetRelease([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Possibly atomically sets the value of a variable to the `newValue` with the semantics of [setRelease(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#setRelease-java.lang.Object...-) if the variable's current value, referred to as the _witness value_, `==` the`expectedValue`, as accessed with the memory semantics of[get(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#get-java.lang.Object...-).  
 This operation may fail spuriously (typically, due to memory contention) even if the witness value does match the expected value.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)boolean`.  
 The symbolic type descriptor at the call site of ` weakCompareAndSetRelease` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.WEAK_COMPARE_AND_SET_RELEASE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T expectedValue, T newValue)` , statically represented using varargs.  
 Returns:  
 `true` if successful, otherwise `false` if the witness value was not the same as the `expectedValue` or if this operation spuriously failed.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setRelease(Object...)](../../../java/lang/invoke/VarHandle.html#setRelease-java.lang.Object...-), [get(Object...)](../../../java/lang/invoke/VarHandle.html#get-java.lang.Object...-)  
 * #### getAndSet  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAndSet([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the `newValue` with the memory semantics of [setVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-) and returns the variable's previous value, as accessed with the memory semantics of[getVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-).  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T newValue)T`.  
 The symbolic type descriptor at the call site of `getAndSet` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_AND_SET)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T newValue)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the previous value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-), [getVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-)  
 * #### getAndSetAcquire  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAndSetAcquire([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the `newValue` with the memory semantics of [set(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#set-java.lang.Object...-) and returns the variable's previous value, as accessed with the memory semantics of[getAcquire(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#getAcquire-java.lang.Object...-).  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T newValue)T`.  
 The symbolic type descriptor at the call site of `getAndSetAcquire` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_AND_SET_ACQUIRE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T newValue)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the previous value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-), [getVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-)  
 * #### getAndSetRelease  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAndSetRelease([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the `newValue` with the memory semantics of [setRelease(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#setRelease-java.lang.Object...-) and returns the variable's previous value, as accessed with the memory semantics of[get(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#get-java.lang.Object...-).  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T newValue)T`.  
 The symbolic type descriptor at the call site of `getAndSetRelease` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_AND_SET_RELEASE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T newValue)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the previous value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-), [getVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-)  
 * #### getAndAdd  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAndAdd([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically adds the `value` to the current value of a variable with the memory semantics of [setVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-), and returns the variable's previous value, as accessed with the memory semantics of[getVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-).  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T value)T`.  
 The symbolic type descriptor at the call site of `getAndAdd` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_AND_ADD)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T value)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the previous value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-), [getVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-)  
 * #### getAndAddAcquire  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAndAddAcquire([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically adds the `value` to the current value of a variable with the memory semantics of [set(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#set-java.lang.Object...-), and returns the variable's previous value, as accessed with the memory semantics of[getAcquire(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#getAcquire-java.lang.Object...-).  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T value)T`.  
 The symbolic type descriptor at the call site of `getAndAddAcquire` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_AND_ADD_ACQUIRE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T value)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the previous value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-), [getVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-)  
 * #### getAndAddRelease  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAndAddRelease([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically adds the `value` to the current value of a variable with the memory semantics of [setRelease(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#setRelease-java.lang.Object...-), and returns the variable's previous value, as accessed with the memory semantics of[get(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#get-java.lang.Object...-).  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T value)T`.  
 The symbolic type descriptor at the call site of `getAndAddRelease` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_AND_ADD_RELEASE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T value)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the previous value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-), [getVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-)  
 * #### getAndBitwiseOr  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAndBitwiseOr([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the result of bitwise OR between the variable's current value and the `mask` with the memory semantics of [setVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-) and returns the variable's previous value, as accessed with the memory semantics of[getVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-).  
 If the variable type is the non-integral `boolean` type then a logical OR is performed instead of a bitwise OR.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T mask)T`.  
 The symbolic type descriptor at the call site of `getAndBitwiseOr` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_AND_BITWISE_OR)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T mask)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the previous value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-), [getVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-)  
 * #### getAndBitwiseOrAcquire  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAndBitwiseOrAcquire([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the result of bitwise OR between the variable's current value and the `mask` with the memory semantics of [set(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#set-java.lang.Object...-) and returns the variable's previous value, as accessed with the memory semantics of[getAcquire(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#getAcquire-java.lang.Object...-).  
 If the variable type is the non-integral `boolean` type then a logical OR is performed instead of a bitwise OR.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T mask)T`.  
 The symbolic type descriptor at the call site of `getAndBitwiseOrAcquire` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_AND_BITWISE_OR_ACQUIRE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T mask)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the previous value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [set(Object...)](../../../java/lang/invoke/VarHandle.html#set-java.lang.Object...-), [getAcquire(Object...)](../../../java/lang/invoke/VarHandle.html#getAcquire-java.lang.Object...-)  
 * #### getAndBitwiseOrRelease  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAndBitwiseOrRelease([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the result of bitwise OR between the variable's current value and the `mask` with the memory semantics of [setRelease(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#setRelease-java.lang.Object...-) and returns the variable's previous value, as accessed with the memory semantics of[get(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#get-java.lang.Object...-).  
 If the variable type is the non-integral `boolean` type then a logical OR is performed instead of a bitwise OR.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T mask)T`.  
 The symbolic type descriptor at the call site of `getAndBitwiseOrRelease` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_AND_BITWISE_OR_RELEASE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T mask)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the previous value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setRelease(Object...)](../../../java/lang/invoke/VarHandle.html#setRelease-java.lang.Object...-), [get(Object...)](../../../java/lang/invoke/VarHandle.html#get-java.lang.Object...-)  
 * #### getAndBitwiseAnd  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAndBitwiseAnd([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the result of bitwise AND between the variable's current value and the `mask` with the memory semantics of [setVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-) and returns the variable's previous value, as accessed with the memory semantics of[getVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-).  
 If the variable type is the non-integral `boolean` type then a logical AND is performed instead of a bitwise AND.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T mask)T`.  
 The symbolic type descriptor at the call site of `getAndBitwiseAnd` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_AND_BITWISE_AND)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T mask)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the previous value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-), [getVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-)  
 * #### getAndBitwiseAndAcquire  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAndBitwiseAndAcquire([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the result of bitwise AND between the variable's current value and the `mask` with the memory semantics of [set(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#set-java.lang.Object...-) and returns the variable's previous value, as accessed with the memory semantics of[getAcquire(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#getAcquire-java.lang.Object...-).  
 If the variable type is the non-integral `boolean` type then a logical AND is performed instead of a bitwise AND.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T mask)T`.  
 The symbolic type descriptor at the call site of `getAndBitwiseAndAcquire` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_AND_BITWISE_AND_ACQUIRE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T mask)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the previous value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [set(Object...)](../../../java/lang/invoke/VarHandle.html#set-java.lang.Object...-), [getAcquire(Object...)](../../../java/lang/invoke/VarHandle.html#getAcquire-java.lang.Object...-)  
 * #### getAndBitwiseAndRelease  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAndBitwiseAndRelease([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the result of bitwise AND between the variable's current value and the `mask` with the memory semantics of [setRelease(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#setRelease-java.lang.Object...-) and returns the variable's previous value, as accessed with the memory semantics of[get(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#get-java.lang.Object...-).  
 If the variable type is the non-integral `boolean` type then a logical AND is performed instead of a bitwise AND.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T mask)T`.  
 The symbolic type descriptor at the call site of `getAndBitwiseAndRelease` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_AND_BITWISE_AND_RELEASE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T mask)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the previous value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setRelease(Object...)](../../../java/lang/invoke/VarHandle.html#setRelease-java.lang.Object...-), [get(Object...)](../../../java/lang/invoke/VarHandle.html#get-java.lang.Object...-)  
 * #### getAndBitwiseXor  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAndBitwiseXor([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the result of bitwise XOR between the variable's current value and the `mask` with the memory semantics of [setVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-) and returns the variable's previous value, as accessed with the memory semantics of[getVolatile(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-).  
 If the variable type is the non-integral `boolean` type then a logical XOR is performed instead of a bitwise XOR.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T mask)T`.  
 The symbolic type descriptor at the call site of `getAndBitwiseXor` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_AND_BITWISE_XOR)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T mask)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the previous value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#setVolatile-java.lang.Object...-), [getVolatile(Object...)](../../../java/lang/invoke/VarHandle.html#getVolatile-java.lang.Object...-)  
 * #### getAndBitwiseXorAcquire  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAndBitwiseXorAcquire([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the result of bitwise XOR between the variable's current value and the `mask` with the memory semantics of [set(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#set-java.lang.Object...-) and returns the variable's previous value, as accessed with the memory semantics of[getAcquire(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#getAcquire-java.lang.Object...-).  
 If the variable type is the non-integral `boolean` type then a logical XOR is performed instead of a bitwise XOR.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T mask)T`.  
 The symbolic type descriptor at the call site of `getAndBitwiseXorAcquire` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_AND_BITWISE_XOR_ACQUIRE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T mask)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the previous value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [set(Object...)](../../../java/lang/invoke/VarHandle.html#set-java.lang.Object...-), [getAcquire(Object...)](../../../java/lang/invoke/VarHandle.html#getAcquire-java.lang.Object...-)  
 * #### getAndBitwiseXorRelease  
 public final [Object](../../../java/lang/Object.html "class in java.lang") getAndBitwiseXorRelease([Object](../../../java/lang/Object.html "class in java.lang")... args)  
 Atomically sets the value of a variable to the result of bitwise XOR between the variable's current value and the `mask` with the memory semantics of [setRelease(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#setRelease-java.lang.Object...-) and returns the variable's previous value, as accessed with the memory semantics of[get(java.lang.Object...)](../../../java/lang/invoke/VarHandle.html#get-java.lang.Object...-).  
 If the variable type is the non-integral `boolean` type then a logical XOR is performed instead of a bitwise XOR.  
 The method signature is of the form `(CT1 ct1, ..., CTn ctn, T mask)T`.  
 The symbolic type descriptor at the call site of `getAndBitwiseXorRelease` must match the access mode type that is the result of calling`accessModeType(VarHandle.AccessMode.GET_AND_BITWISE_XOR_RELEASE)` on this VarHandle.  
 Parameters:  
 `args` \- the signature-polymorphic parameter list of the form`(CT1 ct1, ..., CTn ctn, T mask)` , statically represented using varargs.  
 Returns:  
 the signature-polymorphic result that is the previous value of the variable , statically represented using `Object`.  
 Throws:  
 `[UnsupportedOperationException](../../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- if the access mode is unsupported for this VarHandle.  
 `[WrongMethodTypeException](../../../java/lang/invoke/WrongMethodTypeException.html "class in java.lang.invoke")` \- if the access mode type does not match the caller's symbolic type descriptor.  
 `[ClassCastException](../../../java/lang/ClassCastException.html "class in java.lang")` \- if the access mode type matches the caller's symbolic type descriptor, but a reference cast fails.  
 See Also:  
 [setRelease(Object...)](../../../java/lang/invoke/VarHandle.html#setRelease-java.lang.Object...-), [get(Object...)](../../../java/lang/invoke/VarHandle.html#get-java.lang.Object...-)  
 * #### varType  
 public final [Class](../../../java/lang/Class.html "class in java.lang")<?> varType()  
 Returns the variable type of variables referenced by this VarHandle.  
 Returns:  
 the variable type of variables referenced by this VarHandle  
 * #### coordinateTypes  
 public final [List](../../../java/util/List.html "interface in java.util")<[Class](../../../java/lang/Class.html "class in java.lang")<?>> coordinateTypes()  
 Returns the coordinate types for this VarHandle.  
 Returns:  
 the coordinate types for this VarHandle. The returned list is unmodifiable  
 * #### accessModeType  
 public final [MethodType](../../../java/lang/invoke/MethodType.html "class in java.lang.invoke") accessModeType([VarHandle.AccessMode](../../../java/lang/invoke/VarHandle.AccessMode.html "enum in java.lang.invoke") accessMode)  
 Obtains the access mode type for this VarHandle and a given access mode.  
 The access mode type's parameter types will consist of a prefix that is the coordinate types of this VarHandle followed by further types as defined by the access mode method. The access mode type's return type is defined by the return type of the access mode method.  
 Parameters:  
 `accessMode` \- the access mode, corresponding to the signature-polymorphic method of the same name  
 Returns:  
 the access mode type for the given access mode  
 * #### isAccessModeSupported  
 public final boolean isAccessModeSupported([VarHandle.AccessMode](../../../java/lang/invoke/VarHandle.AccessMode.html "enum in java.lang.invoke") accessMode)  
 Returns `true` if the given access mode is supported, otherwise`false`.  
 The return of a `false` value for a given access mode indicates that an `UnsupportedOperationException` is thrown on invocation of the corresponding access mode method.  
 Parameters:  
 `accessMode` \- the access mode, corresponding to the signature-polymorphic method of the same name  
 Returns:  
 `true` if the given access mode is supported, otherwise`false`.  
 * #### toMethodHandle  
 public final [MethodHandle](../../../java/lang/invoke/MethodHandle.html "class in java.lang.invoke") toMethodHandle([VarHandle.AccessMode](../../../java/lang/invoke/VarHandle.AccessMode.html "enum in java.lang.invoke") accessMode)  
 Obtains a method handle bound to this VarHandle and the given access mode.  
 API Note:  
 This method, for a VarHandle `vh` and access mode`{access-mode}`, returns a method handle that is equivalent to method handle `bmh` in the following code (though it may be more efficient):  
 ```  
  MethodHandle mh = MethodHandles.varHandleExactInvoker(  
                        vh.accessModeType(VarHandle.AccessMode.{access-mode}));  
  MethodHandle bmh = mh.bindTo(vh);  
        
 ```  
 Parameters:  
 `accessMode` \- the access mode, corresponding to the signature-polymorphic method of the same name  
 Returns:  
 a method handle bound to this VarHandle and the given access mode  
 * #### fullFence  
 public static void fullFence()  
 Ensures that loads and stores before the fence will not be reordered with loads and stores after the fence.  
 API Note:  
 Ignoring the many semantic differences from C and C++, this method has memory ordering effects compatible with`atomic_thread_fence(memory_order_seq_cst)`  
 * #### acquireFence  
 public static void acquireFence()  
 Ensures that loads before the fence will not be reordered with loads and stores after the fence.  
 API Note:  
 Ignoring the many semantic differences from C and C++, this method has memory ordering effects compatible with`atomic_thread_fence(memory_order_acquire)`  
 * #### releaseFence  
 public static void releaseFence()  
 Ensures that loads and stores before the fence will not be reordered with stores after the fence.  
 API Note:  
 Ignoring the many semantic differences from C and C++, this method has memory ordering effects compatible with`atomic_thread_fence(memory_order_release)`  
 * #### loadLoadFence  
 public static void loadLoadFence()  
 Ensures that loads before the fence will not be reordered with loads after the fence.  
 * #### storeStoreFence  
 public static void storeStoreFence()  
 Ensures that stores before the fence will not be reordered with stores after the fence.