AtomicLongArray (Java Platform SE 7 ) (original) (raw)

• java.lang.Object

• • java.util.concurrent.atomic.AtomicLongArray

• All Implemented Interfaces:
  Serializable

public class AtomicLongArray
extends Object
implements Serializable
A long array in which elements may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables.
Since:
1.5
See Also:
Serialized Form

• • Constructor Summary

  Constructors

  Constructor and Description
  AtomicLongArray(int length) Creates a new AtomicLongArray of the given length, with all elements initially zero.
  AtomicLongArray(long[] array) Creates a new AtomicLongArray with the same length as, and all elements copied from, the given array.

  • Method Summary

  Methods

  Modifier and Type	Method and Description
  long	addAndGet(int i, long delta) Atomically adds the given value to the element at index i.
  boolean	compareAndSet(int i, long expect, long update) Atomically sets the element at position i to the given updated value if the current value == the expected value.
  long	decrementAndGet(int i) Atomically decrements by one the element at index i.
  long	get(int i) Gets the current value at position i.
  long	getAndAdd(int i, long delta) Atomically adds the given value to the element at index i.
  long	getAndDecrement(int i) Atomically decrements by one the element at index i.
  long	getAndIncrement(int i) Atomically increments by one the element at index i.
  long	getAndSet(int i, long newValue) Atomically sets the element at position i to the given value and returns the old value.
  long	incrementAndGet(int i) Atomically increments by one the element at index i.
  void	lazySet(int i, long newValue) Eventually sets the element at position i to the given value.
  int	length() Returns the length of the array.
  void	set(int i, long newValue) Sets the element at position i to the given value.
  String	toString() Returns the String representation of the current values of array.
  boolean	weakCompareAndSet(int i, long expect, long update) Atomically sets the element at position i to the given updated value if the current value == the expected value.

     * ### Methods inherited from class java.lang.[Object](../../../../java/lang/Object.html "class in java.lang")  
     `[clone](../../../../java/lang/Object.html#clone%28%29), [equals](../../../../java/lang/Object.html#equals%28java.lang.Object%29), [finalize](../../../../java/lang/Object.html#finalize%28%29), [getClass](../../../../java/lang/Object.html#getClass%28%29), [hashCode](../../../../java/lang/Object.html#hashCode%28%29), [notify](../../../../java/lang/Object.html#notify%28%29), [notifyAll](../../../../java/lang/Object.html#notifyAll%28%29), [wait](../../../../java/lang/Object.html#wait%28%29), [wait](../../../../java/lang/Object.html#wait%28long%29), [wait](../../../../java/lang/Object.html#wait%28long,%20int%29)`

• • Constructor Detail

     * #### AtomicLongArray  
     public AtomicLongArray(int length)  
     Creates a new AtomicLongArray of the given length, with all elements initially zero.  
     Parameters:  
     `length` \- the length of the array  
     * #### AtomicLongArray  
     public AtomicLongArray(long[] array)  
     Creates a new AtomicLongArray with the same length as, and all elements copied from, the given array.  
     Parameters:  
     `array` \- the array to copy elements from  
     Throws:  
     `[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang")` \- if array is null  

  • Method Detail

    * #### length  
    public final int length()  
    Returns the length of the array.  
    Returns:  
    the length of the array  
    * #### get  
    public final long get(int i)  
    Gets the current value at position `i`.  
    Parameters:  
    `i` \- the index  
    Returns:  
    the current value  
    * #### set  
    public final void set(int i,  
           long newValue)  
    Sets the element at position `i` to the given value.  
    Parameters:  
    `i` \- the index  
    `newValue` \- the new value  
    * #### lazySet  
    public final void lazySet(int i,  
               long newValue)  
    Eventually sets the element at position `i` to the given value.  
    Parameters:  
    `i` \- the index  
    `newValue` \- the new value  
    Since:  
    1.6  
    * #### getAndSet  
    public final long getAndSet(int i,  
                 long newValue)  
    Atomically sets the element at position `i` to the given value and returns the old value.  
    Parameters:  
    `i` \- the index  
    `newValue` \- the new value  
    Returns:  
    the previous value  
    * #### compareAndSet  
    public final boolean compareAndSet(int i,  
                        long expect,  
                        long update)  
    Atomically sets the element at position `i` to the given updated value if the current value `==` the expected value.  
    Parameters:  
    `i` \- the index  
    `expect` \- the expected value  
    `update` \- the new value  
    Returns:  
    true if successful. False return indicates that the actual value was not equal to the expected value.  
    * #### weakCompareAndSet  
    public final boolean weakCompareAndSet(int i,  
                            long expect,  
                            long update)  
    Atomically sets the element at position `i` to the given updated value if the current value `==` the expected value.  
    May [fail spuriously](package-summary.html#Spurious) and does not provide ordering guarantees, so is only rarely an appropriate alternative to `compareAndSet`.  
    Parameters:  
    `i` \- the index  
    `expect` \- the expected value  
    `update` \- the new value  
    Returns:  
    true if successful.  
    * #### getAndIncrement  
    public final long getAndIncrement(int i)  
    Atomically increments by one the element at index `i`.  
    Parameters:  
    `i` \- the index  
    Returns:  
    the previous value  
    * #### getAndDecrement  
    public final long getAndDecrement(int i)  
    Atomically decrements by one the element at index `i`.  
    Parameters:  
    `i` \- the index  
    Returns:  
    the previous value  
    * #### getAndAdd  
    public final long getAndAdd(int i,  
                 long delta)  
    Atomically adds the given value to the element at index `i`.  
    Parameters:  
    `i` \- the index  
    `delta` \- the value to add  
    Returns:  
    the previous value  
    * #### incrementAndGet  
    public final long incrementAndGet(int i)  
    Atomically increments by one the element at index `i`.  
    Parameters:  
    `i` \- the index  
    Returns:  
    the updated value  
    * #### decrementAndGet  
    public final long decrementAndGet(int i)  
    Atomically decrements by one the element at index `i`.  
    Parameters:  
    `i` \- the index  
    Returns:  
    the updated value  
    * #### addAndGet  
    public long addAndGet(int i,  
                 long delta)  
    Atomically adds the given value to the element at index `i`.  
    Parameters:  
    `i` \- the index  
    `delta` \- the value to add  
    Returns:  
    the updated value  
    * #### toString  
    public [String](../../../../java/lang/String.html "class in java.lang") toString()  
    Returns the String representation of the current values of array.  
    **Overrides:**  
    `[toString](../../../../java/lang/Object.html#toString%28%29)` in class `[Object](../../../../java/lang/Object.html "class in java.lang")`  
    Returns:  
    the String representation of the current values of array

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