* #### allocate
public static [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") allocate(int capacity)
Allocates a new char buffer.
The new buffer's position will be zero, its limit will be its capacity, its mark will be undefined, and each of its elements will be initialized to zero. It will have a [backing array](../../java/nio/CharBuffer.html#array--), and its [array offset](../../java/nio/CharBuffer.html#arrayOffset--) will be zero.
Parameters:
`capacity` \- The new buffer's capacity, in chars
Returns:
The new char buffer
Throws:
`[IllegalArgumentException](../../java/lang/IllegalArgumentException.html "class in java.lang")` \- If the capacity is a negative integer
* #### wrap
public static [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") wrap(char[] array,
int offset,
int length)
Wraps a char array into a buffer.
The new buffer will be backed by the given char array; that is, modifications to the buffer will cause the array to be modified and vice versa. The new buffer's capacity will bearray.length, its position will be offset, its limit will be offset + length, and its mark will be undefined. Its[backing array](../../java/nio/CharBuffer.html#array--) will be the given array, and its [array offset](../../java/nio/CharBuffer.html#arrayOffset--) will be zero.
Parameters:
`array` \- The array that will back the new buffer
`offset` \- The offset of the subarray to be used; must be non-negative and no larger than array.length. The new buffer's position will be set to this value.
`length` \- The length of the subarray to be used; must be non-negative and no larger thanarray.length - offset. The new buffer's limit will be set to offset + length.
Returns:
The new char buffer
Throws:
`[IndexOutOfBoundsException](../../java/lang/IndexOutOfBoundsException.html "class in java.lang")` \- If the preconditions on the offset and length parameters do not hold
* #### wrap
public static [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") wrap(char[] array)
Wraps a char array into a buffer.
The new buffer will be backed by the given char array; that is, modifications to the buffer will cause the array to be modified and vice versa. The new buffer's capacity and limit will bearray.length, its position will be zero, and its mark will be undefined. Its [backing array](../../java/nio/CharBuffer.html#array--) will be the given array, and its [array offset>](../../java/nio/CharBuffer.html#arrayOffset--) will be zero.
Parameters:
`array` \- The array that will back this buffer
Returns:
The new char buffer
* #### read
public int read([CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") target)
throws [IOException](../../java/io/IOException.html "class in java.io")
Attempts to read characters into the specified character buffer. The buffer is used as a repository of characters as-is: the only changes made are the results of a put operation. No flipping or rewinding of the buffer is performed.
Specified by:
`[read](../../java/lang/Readable.html#read-java.nio.CharBuffer-)` in interface `[Readable](../../java/lang/Readable.html "interface in java.lang")`
Parameters:
`target` \- the buffer to read characters into
Returns:
The number of characters added to the buffer, or -1 if this source of characters is at its end
Throws:
`[IOException](../../java/io/IOException.html "class in java.io")` \- if an I/O error occurs
`[NullPointerException](../../java/lang/NullPointerException.html "class in java.lang")` \- if target is null
`[ReadOnlyBufferException](../../java/nio/ReadOnlyBufferException.html "class in java.nio")` \- if target is a read only buffer
Since:
1.5
* #### wrap
public static [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") wrap([CharSequence](../../java/lang/CharSequence.html "interface in java.lang") csq,
int start,
int end)
Wraps a character sequence into a buffer.
The content of the new, read-only buffer will be the content of the given character sequence. The buffer's capacity will becsq.length(), its position will be start, its limit will be end, and its mark will be undefined.
Parameters:
`csq` \- The character sequence from which the new character buffer is to be created
`start` \- The index of the first character to be used; must be non-negative and no larger than csq.length(). The new buffer's position will be set to this value.
`end` \- The index of the character following the last character to be used; must be no smaller than start and no larger than csq.length(). The new buffer's limit will be set to this value.
Returns:
The new character buffer
Throws:
`[IndexOutOfBoundsException](../../java/lang/IndexOutOfBoundsException.html "class in java.lang")` \- If the preconditions on the start and end parameters do not hold
* #### wrap
public static [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") wrap([CharSequence](../../java/lang/CharSequence.html "interface in java.lang") csq)
Wraps a character sequence into a buffer.
The content of the new, read-only buffer will be the content of the given character sequence. The new buffer's capacity and limit will becsq.length(), its position will be zero, and its mark will be undefined.
Parameters:
`csq` \- The character sequence from which the new character buffer is to be created
Returns:
The new character buffer
* #### slice
public abstract [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") slice()
Creates a new char buffer whose content is a shared subsequence of this buffer's content.
The content of the new buffer will start at this buffer's current position. Changes to this buffer's content will be visible in the new buffer, and vice versa; the two buffers' position, limit, and mark values will be independent.
The new buffer's position will be zero, its capacity and its limit will be the number of chars remaining in this buffer, and its mark will be undefined. The new buffer will be direct if, and only if, this buffer is direct, and it will be read-only if, and only if, this buffer is read-only.
Returns:
The new char buffer
* #### duplicate
public abstract [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") duplicate()
Creates a new char buffer that shares this buffer's content.
The content of the new buffer will be that of this buffer. Changes to this buffer's content will be visible in the new buffer, and vice versa; the two buffers' position, limit, and mark values will be independent.
The new buffer's capacity, limit, position, and mark values will be identical to those of this buffer. The new buffer will be direct if, and only if, this buffer is direct, and it will be read-only if, and only if, this buffer is read-only.
Returns:
The new char buffer
* #### asReadOnlyBuffer
public abstract [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") asReadOnlyBuffer()
Creates a new, read-only char buffer that shares this buffer's content.
The content of the new buffer will be that of this buffer. Changes to this buffer's content will be visible in the new buffer; the new buffer itself, however, will be read-only and will not allow the shared content to be modified. The two buffers' position, limit, and mark values will be independent.
The new buffer's capacity, limit, position, and mark values will be identical to those of this buffer.
If this buffer is itself read-only then this method behaves in exactly the same way as the [duplicate](../../java/nio/CharBuffer.html#duplicate--) method.
Returns:
The new, read-only char buffer
* #### get
public abstract char get()
Relative _get_ method. Reads the char at this buffer's current position, and then increments the position.
Returns:
The char at the buffer's current position
Throws:
`[BufferUnderflowException](../../java/nio/BufferUnderflowException.html "class in java.nio")` \- If the buffer's current position is not smaller than its limit
* #### put
public abstract [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") put(char c)
Relative _put_ method _(optional operation)_.
Writes the given char into this buffer at the current position, and then increments the position.
Parameters:
`c` \- The char to be written
Returns:
This buffer
Throws:
`[BufferOverflowException](../../java/nio/BufferOverflowException.html "class in java.nio")` \- If this buffer's current position is not smaller than its limit
`[ReadOnlyBufferException](../../java/nio/ReadOnlyBufferException.html "class in java.nio")` \- If this buffer is read-only
* #### get
public abstract char get(int index)
Absolute _get_ method. Reads the char at the given index.
Parameters:
`index` \- The index from which the char will be read
Returns:
The char at the given index
Throws:
`[IndexOutOfBoundsException](../../java/lang/IndexOutOfBoundsException.html "class in java.lang")` \- If index is negative or not smaller than the buffer's limit
* #### put
public abstract [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") put(int index,
char c)
Absolute _put_ method _(optional operation)_.
Writes the given char into this buffer at the given index.
Parameters:
`index` \- The index at which the char will be written
`c` \- The char value to be written
Returns:
This buffer
Throws:
`[IndexOutOfBoundsException](../../java/lang/IndexOutOfBoundsException.html "class in java.lang")` \- If index is negative or not smaller than the buffer's limit
`[ReadOnlyBufferException](../../java/nio/ReadOnlyBufferException.html "class in java.nio")` \- If this buffer is read-only
* #### get
public [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") get(char[] dst,
int offset,
int length)
Relative bulk _get_ method.
This method transfers chars from this buffer into the given destination array. If there are fewer chars remaining in the buffer than are required to satisfy the request, that is, iflength \> remaining(), then no chars are transferred and a [BufferUnderflowException](../../java/nio/BufferUnderflowException.html "class in java.nio") is thrown.
Otherwise, this method copies length chars from this buffer into the given array, starting at the current position of this buffer and at the given offset in the array. The position of this buffer is then incremented by length.
In other words, an invocation of this method of the formsrc.get(dst, off, len) has exactly the same effect as the loop
```
for (int i = off; i < off + len; i++)
dst[i] = src.get():
```
except that it first checks that there are sufficient chars in this buffer and it is potentially much more efficient.
Parameters:
`dst` \- The array into which chars are to be written
`offset` \- The offset within the array of the first char to be written; must be non-negative and no larger thandst.length
`length` \- The maximum number of chars to be written to the given array; must be non-negative and no larger thandst.length - offset
Returns:
This buffer
Throws:
`[BufferUnderflowException](../../java/nio/BufferUnderflowException.html "class in java.nio")` \- If there are fewer than length chars remaining in this buffer
`[IndexOutOfBoundsException](../../java/lang/IndexOutOfBoundsException.html "class in java.lang")` \- If the preconditions on the offset and length parameters do not hold
* #### get
public [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") get(char[] dst)
Relative bulk _get_ method.
This method transfers chars from this buffer into the given destination array. An invocation of this method of the formsrc.get(a) behaves in exactly the same way as the invocation
src.get(a, 0, a.length)
Parameters:
`dst` \- The destination array
Returns:
This buffer
Throws:
`[BufferUnderflowException](../../java/nio/BufferUnderflowException.html "class in java.nio")` \- If there are fewer than length chars remaining in this buffer
* #### put
public [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") put([CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") src)
Relative bulk _put_ method _(optional operation)_.
This method transfers the chars remaining in the given source buffer into this buffer. If there are more chars remaining in the source buffer than in this buffer, that is, ifsrc.remaining() \> remaining(), then no chars are transferred and a [BufferOverflowException](../../java/nio/BufferOverflowException.html "class in java.nio") is thrown.
Otherwise, this method copies_n_ \= src.remaining() chars from the given buffer into this buffer, starting at each buffer's current position. The positions of both buffers are then incremented by _n_.
In other words, an invocation of this method of the formdst.put(src) has exactly the same effect as the loop
while (src.hasRemaining())
dst.put(src.get());
except that it first checks that there is sufficient space in this buffer and it is potentially much more efficient.
Parameters:
`src` \- The source buffer from which chars are to be read; must not be this buffer
Returns:
This buffer
Throws:
`[BufferOverflowException](../../java/nio/BufferOverflowException.html "class in java.nio")` \- If there is insufficient space in this buffer for the remaining chars in the source buffer
`[IllegalArgumentException](../../java/lang/IllegalArgumentException.html "class in java.lang")` \- If the source buffer is this buffer
`[ReadOnlyBufferException](../../java/nio/ReadOnlyBufferException.html "class in java.nio")` \- If this buffer is read-only
* #### put
public [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") put(char[] src,
int offset,
int length)
Relative bulk _put_ method _(optional operation)_.
This method transfers chars into this buffer from the given source array. If there are more chars to be copied from the array than remain in this buffer, that is, iflength \> remaining(), then no chars are transferred and a [BufferOverflowException](../../java/nio/BufferOverflowException.html "class in java.nio") is thrown.
Otherwise, this method copies length chars from the given array into this buffer, starting at the given offset in the array and at the current position of this buffer. The position of this buffer is then incremented by length.
In other words, an invocation of this method of the formdst.put(src, off, len) has exactly the same effect as the loop
```
for (int i = off; i < off + len; i++)
dst.put(a[i]);
```
except that it first checks that there is sufficient space in this buffer and it is potentially much more efficient.
Parameters:
`src` \- The array from which chars are to be read
`offset` \- The offset within the array of the first char to be read; must be non-negative and no larger than array.length
`length` \- The number of chars to be read from the given array; must be non-negative and no larger thanarray.length - offset
Returns:
This buffer
Throws:
`[BufferOverflowException](../../java/nio/BufferOverflowException.html "class in java.nio")` \- If there is insufficient space in this buffer
`[IndexOutOfBoundsException](../../java/lang/IndexOutOfBoundsException.html "class in java.lang")` \- If the preconditions on the offset and length parameters do not hold
`[ReadOnlyBufferException](../../java/nio/ReadOnlyBufferException.html "class in java.nio")` \- If this buffer is read-only
* #### put
public final [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") put(char[] src)
Relative bulk _put_ method _(optional operation)_.
This method transfers the entire content of the given source char array into this buffer. An invocation of this method of the form dst.put(a) behaves in exactly the same way as the invocation
dst.put(a, 0, a.length)
Parameters:
`src` \- The source array
Returns:
This buffer
Throws:
`[BufferOverflowException](../../java/nio/BufferOverflowException.html "class in java.nio")` \- If there is insufficient space in this buffer
`[ReadOnlyBufferException](../../java/nio/ReadOnlyBufferException.html "class in java.nio")` \- If this buffer is read-only
* #### put
public [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") put([String](../../java/lang/String.html "class in java.lang") src,
int start,
int end)
Relative bulk _put_ method _(optional operation)_.
This method transfers chars from the given string into this buffer. If there are more chars to be copied from the string than remain in this buffer, that is, ifend - start \> remaining(), then no chars are transferred and a [BufferOverflowException](../../java/nio/BufferOverflowException.html "class in java.nio") is thrown.
Otherwise, this method copies_n_ \= end \- start chars from the given string into this buffer, starting at the givenstart index and at the current position of this buffer. The position of this buffer is then incremented by _n_.
In other words, an invocation of this method of the formdst.put(src, start, end) has exactly the same effect as the loop
```
for (int i = start; i < end; i++)
dst.put(src.charAt(i));
```
except that it first checks that there is sufficient space in this buffer and it is potentially much more efficient.
Parameters:
`src` \- The string from which chars are to be read
`start` \- The offset within the string of the first char to be read; must be non-negative and no larger thanstring.length()
`end` \- The offset within the string of the last char to be read, plus one; must be non-negative and no larger thanstring.length()
Returns:
This buffer
Throws:
`[BufferOverflowException](../../java/nio/BufferOverflowException.html "class in java.nio")` \- If there is insufficient space in this buffer
`[IndexOutOfBoundsException](../../java/lang/IndexOutOfBoundsException.html "class in java.lang")` \- If the preconditions on the start and end parameters do not hold
`[ReadOnlyBufferException](../../java/nio/ReadOnlyBufferException.html "class in java.nio")` \- If this buffer is read-only
* #### put
public final [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") put([String](../../java/lang/String.html "class in java.lang") src)
Relative bulk _put_ method _(optional operation)_.
This method transfers the entire content of the given source string into this buffer. An invocation of this method of the formdst.put(s) behaves in exactly the same way as the invocation
dst.put(s, 0, s.length())
Parameters:
`src` \- The source string
Returns:
This buffer
Throws:
`[BufferOverflowException](../../java/nio/BufferOverflowException.html "class in java.nio")` \- If there is insufficient space in this buffer
`[ReadOnlyBufferException](../../java/nio/ReadOnlyBufferException.html "class in java.nio")` \- If this buffer is read-only
* #### hasArray
public final boolean hasArray()
Tells whether or not this buffer is backed by an accessible char array.
If this method returns true then the [array](../../java/nio/CharBuffer.html#array--) and [arrayOffset](../../java/nio/CharBuffer.html#arrayOffset--) methods may safely be invoked.
Specified by:
`[hasArray](../../java/nio/Buffer.html#hasArray--)` in class `[Buffer](../../java/nio/Buffer.html "class in java.nio")`
Returns:
true if, and only if, this buffer is backed by an array and is not read-only
* #### array
public final char[] array()
Returns the char array that backs this buffer _(optional operation)_.
Modifications to this buffer's content will cause the returned array's content to be modified, and vice versa.
Invoke the [hasArray](../../java/nio/CharBuffer.html#hasArray--) method before invoking this method in order to ensure that this buffer has an accessible backing array.
Specified by:
`[array](../../java/nio/Buffer.html#array--)` in class `[Buffer](../../java/nio/Buffer.html "class in java.nio")`
Returns:
The array that backs this buffer
Throws:
`[ReadOnlyBufferException](../../java/nio/ReadOnlyBufferException.html "class in java.nio")` \- If this buffer is backed by an array but is read-only
`[UnsupportedOperationException](../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- If this buffer is not backed by an accessible array
* #### arrayOffset
public final int arrayOffset()
Returns the offset within this buffer's backing array of the first element of the buffer _(optional operation)_.
If this buffer is backed by an array then buffer position _p_ corresponds to array index _p_ \+ arrayOffset().
Invoke the [hasArray](../../java/nio/CharBuffer.html#hasArray--) method before invoking this method in order to ensure that this buffer has an accessible backing array.
Specified by:
`[arrayOffset](../../java/nio/Buffer.html#arrayOffset--)` in class `[Buffer](../../java/nio/Buffer.html "class in java.nio")`
Returns:
The offset within this buffer's array of the first element of the buffer
Throws:
`[ReadOnlyBufferException](../../java/nio/ReadOnlyBufferException.html "class in java.nio")` \- If this buffer is backed by an array but is read-only
`[UnsupportedOperationException](../../java/lang/UnsupportedOperationException.html "class in java.lang")` \- If this buffer is not backed by an accessible array
* #### compact
public abstract [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") compact()
Compacts this buffer _(optional operation)_.
The chars between the buffer's current position and its limit, if any, are copied to the beginning of the buffer. That is, the char at index _p_ \= position() is copied to index zero, the char at index _p_ \+ 1 is copied to index one, and so forth until the char at indexlimit() \- 1 is copied to index_n_ \= limit() \- 1 \- _p_. The buffer's position is then set to _n+1_ and its limit is set to its capacity. The mark, if defined, is discarded.
The buffer's position is set to the number of chars copied, rather than to zero, so that an invocation of this method can be followed immediately by an invocation of another relative _put_ method.
Returns:
This buffer
Throws:
`[ReadOnlyBufferException](../../java/nio/ReadOnlyBufferException.html "class in java.nio")` \- If this buffer is read-only
* #### isDirect
public abstract boolean isDirect()
Tells whether or not this char buffer is direct.
Specified by:
`[isDirect](../../java/nio/Buffer.html#isDirect--)` in class `[Buffer](../../java/nio/Buffer.html "class in java.nio")`
Returns:
true if, and only if, this buffer is direct
* #### hashCode
public int hashCode()
Returns the current hash code of this buffer.
The hash code of a char buffer depends only upon its remaining elements; that is, upon the elements from position() up to, and including, the element at limit() \- 1.
Because buffer hash codes are content-dependent, it is inadvisable to use buffers as keys in hash maps or similar data structures unless it is known that their contents will not change.
Overrides:
`[hashCode](../../java/lang/Object.html#hashCode--)` in class `[Object](../../java/lang/Object.html "class in java.lang")`
Returns:
The current hash code of this buffer
See Also:
[Object.equals(java.lang.Object)](../../java/lang/Object.html#equals-java.lang.Object-), [System.identityHashCode(java.lang.Object)](../../java/lang/System.html#identityHashCode-java.lang.Object-)
* #### equals
public boolean equals([Object](../../java/lang/Object.html "class in java.lang") ob)
Tells whether or not this buffer is equal to another object.
Two char buffers are equal if, and only if,
1. They have the same element type,
2. They have the same number of remaining elements, and
3. The two sequences of remaining elements, considered independently of their starting positions, are pointwise equal.
A char buffer is not equal to any other type of object.
Overrides:
`[equals](../../java/lang/Object.html#equals-java.lang.Object-)` in class `[Object](../../java/lang/Object.html "class in java.lang")`
Parameters:
`ob` \- The object to which this buffer is to be compared
Returns:
true if, and only if, this buffer is equal to the given object
See Also:
[Object.hashCode()](../../java/lang/Object.html#hashCode--), [HashMap](../../java/util/HashMap.html "class in java.util")
* #### compareTo
public int compareTo([CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") that)
Compares this buffer to another.
Two char buffers are compared by comparing their sequences of remaining elements lexicographically, without regard to the starting position of each sequence within its corresponding buffer. Pairs of `char` elements are compared as if by invoking[Character.compare(char,char)](../../java/lang/Character.html#compare-char-char-).
A char buffer is not comparable to any other type of object.
Specified by:
`[compareTo](../../java/lang/Comparable.html#compareTo-T-)` in interface `[Comparable](../../java/lang/Comparable.html "interface in java.lang")<[CharBuffer](../../java/nio/CharBuffer.html "class in java.nio")>`
Parameters:
`that` \- the object to be compared.
Returns:
A negative integer, zero, or a positive integer as this buffer is less than, equal to, or greater than the given buffer
* #### toString
public [String](../../java/lang/String.html "class in java.lang") toString()
Returns a string containing the characters in this buffer.
The first character of the resulting string will be the character at this buffer's position, while the last character will be the character at index limit() \- 1\. Invoking this method does not change the buffer's position.
Specified by:
`[toString](../../java/lang/CharSequence.html#toString--)` in interface `[CharSequence](../../java/lang/CharSequence.html "interface in java.lang")`
Overrides:
`[toString](../../java/lang/Object.html#toString--)` in class `[Object](../../java/lang/Object.html "class in java.lang")`
Returns:
The specified string
* #### length
public final int length()
Returns the length of this character buffer.
When viewed as a character sequence, the length of a character buffer is simply the number of characters between the position (inclusive) and the limit (exclusive); that is, it is equivalent toremaining().
Specified by:
`[length](../../java/lang/CharSequence.html#length--)` in interface `[CharSequence](../../java/lang/CharSequence.html "interface in java.lang")`
Returns:
The length of this character buffer
* #### charAt
public final char charAt(int index)
Reads the character at the given index relative to the current position.
Specified by:
`[charAt](../../java/lang/CharSequence.html#charAt-int-)` in interface `[CharSequence](../../java/lang/CharSequence.html "interface in java.lang")`
Parameters:
`index` \- The index of the character to be read, relative to the position; must be non-negative and smaller than remaining()
Returns:
The character at indexposition() + index
Throws:
`[IndexOutOfBoundsException](../../java/lang/IndexOutOfBoundsException.html "class in java.lang")` \- If the preconditions on index do not hold
* #### subSequence
public abstract [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") subSequence(int start,
int end)
Creates a new character buffer that represents the specified subsequence of this buffer, relative to the current position.
The new buffer will share this buffer's content; that is, if the content of this buffer is mutable then modifications to one buffer will cause the other to be modified. The new buffer's capacity will be that of this buffer, its position will beposition() \+ start, and its limit will beposition() \+ end. The new buffer will be direct if, and only if, this buffer is direct, and it will be read-only if, and only if, this buffer is read-only.
Specified by:
`[subSequence](../../java/lang/CharSequence.html#subSequence-int-int-)` in interface `[CharSequence](../../java/lang/CharSequence.html "interface in java.lang")`
Parameters:
`start` \- The index, relative to the current position, of the first character in the subsequence; must be non-negative and no larger than remaining()
`end` \- The index, relative to the current position, of the character following the last character in the subsequence; must be no smaller than start and no larger thanremaining()
Returns:
The new character buffer
Throws:
`[IndexOutOfBoundsException](../../java/lang/IndexOutOfBoundsException.html "class in java.lang")` \- If the preconditions on start and end do not hold
* #### append
public [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") append([CharSequence](../../java/lang/CharSequence.html "interface in java.lang") csq)
Appends the specified character sequence to this buffer _(optional operation)_.
An invocation of this method of the form dst.append(csq) behaves in exactly the same way as the invocation
dst.put(csq.toString())
Depending on the specification of toString for the character sequence csq, the entire sequence may not be appended. For instance, invoking the [toString](../../java/nio/CharBuffer.html#toString--) method of a character buffer will return a subsequence whose content depends upon the buffer's position and limit.
Specified by:
`[append](../../java/lang/Appendable.html#append-java.lang.CharSequence-)` in interface `[Appendable](../../java/lang/Appendable.html "interface in java.lang")`
Parameters:
`csq` \- The character sequence to append. If csq isnull, then the four characters "null" are appended to this character buffer.
Returns:
This buffer
Throws:
`[BufferOverflowException](../../java/nio/BufferOverflowException.html "class in java.nio")` \- If there is insufficient space in this buffer
`[ReadOnlyBufferException](../../java/nio/ReadOnlyBufferException.html "class in java.nio")` \- If this buffer is read-only
Since:
1.5
* #### append
public [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") append([CharSequence](../../java/lang/CharSequence.html "interface in java.lang") csq,
int start,
int end)
Appends a subsequence of the specified character sequence to this buffer _(optional operation)_.
An invocation of this method of the form dst.append(csq, start, end) when csq is not null, behaves in exactly the same way as the invocation
dst.put(csq.subSequence(start, end).toString())
Specified by:
`[append](../../java/lang/Appendable.html#append-java.lang.CharSequence-int-int-)` in interface `[Appendable](../../java/lang/Appendable.html "interface in java.lang")`
Parameters:
`csq` \- The character sequence from which a subsequence will be appended. If csq is null, then characters will be appended as if csq contained the four characters "null".
`start` \- The index of the first character in the subsequence
`end` \- The index of the character following the last character in the subsequence
Returns:
This buffer
Throws:
`[BufferOverflowException](../../java/nio/BufferOverflowException.html "class in java.nio")` \- If there is insufficient space in this buffer
`[IndexOutOfBoundsException](../../java/lang/IndexOutOfBoundsException.html "class in java.lang")` \- If start or end are negative, start is greater than end, or end is greater thancsq.length()
`[ReadOnlyBufferException](../../java/nio/ReadOnlyBufferException.html "class in java.nio")` \- If this buffer is read-only
Since:
1.5
* #### append
public [CharBuffer](../../java/nio/CharBuffer.html "class in java.nio") append(char c)
Appends the specified char to this buffer _(optional operation)_.
An invocation of this method of the form dst.append(c) behaves in exactly the same way as the invocation
dst.put(c)
Specified by:
`[append](../../java/lang/Appendable.html#append-char-)` in interface `[Appendable](../../java/lang/Appendable.html "interface in java.lang")`
Parameters:
`c` \- The 16-bit char to append
Returns:
This buffer
Throws:
`[BufferOverflowException](../../java/nio/BufferOverflowException.html "class in java.nio")` \- If there is insufficient space in this buffer
`[ReadOnlyBufferException](../../java/nio/ReadOnlyBufferException.html "class in java.nio")` \- If this buffer is read-only
Since:
1.5
* #### order
public abstract [ByteOrder](../../java/nio/ByteOrder.html "class in java.nio") order()
Retrieves this buffer's byte order.
The byte order of a char buffer created by allocation or by wrapping an existing char array is the [native order](../../java/nio/ByteOrder.html#nativeOrder--) of the underlying hardware. The byte order of a char buffer created as a [view](ByteBuffer.html#views) of a byte buffer is that of the byte buffer at the moment that the view is created.
Returns:
This buffer's byte order
* #### chars
public [IntStream](../../java/util/stream/IntStream.html "interface in java.util.stream") chars()
Returns a stream of `int` zero-extending the `char` values from this sequence. Any char which maps to a [surrogate code point](../../java/lang/Character.html#unicode) is passed through uninterpreted.
If the sequence is mutated while the stream is being read, the result is undefined.
Specified by:
`[chars](../../java/lang/CharSequence.html#chars--)` in interface `[CharSequence](../../java/lang/CharSequence.html "interface in java.lang")`
Returns:
an IntStream of char values from this sequence