IT. Expert System.

Android Reference

CharBuffer

java.nio

Class CharBuffer

java.lang.Object
- java.nio.Buffer
- - java.nio.CharBuffer

All Implemented Interfaces:

Appendable, CharSequence, Comparable<CharBuffer>, Readable
```
public abstract class CharBuffer
extends Buffer
implements Comparable<CharBuffer>, CharSequence, Appendable, Readable
```
A buffer of chars.
A char buffer can be created in either one of the following ways:
- Allocate a new char array and create a buffer based on it;
- Wrap an existing char array to create a new buffer;
- Wrap an existing char sequence to create a new buffer;
- Use ByteBuffer.asCharBuffer to create a char buffer based on a byte buffer.

Method Summary

Methods
Modifier and Type	Method and Description
`static CharBuffer`	`allocate(int capacity)` Creates a char buffer based on a newly allocated char array.
`CharBuffer`	`append(char c)` Writes the given char to the current position and increases the position by 1.
`CharBuffer`	`append(CharSequence csq)` Writes all chars of the given character sequence `csq` to the current position of this buffer, and increases the position by the length of the csq.
`CharBuffer`	`append(CharSequence csq, int start, int end)` Writes chars of the given `CharSequence` to the current position of this buffer, and increases the position by the number of chars written.
`char[]`	`array()` Returns the array that backs this buffer (optional operation).
`int`	`arrayOffset()` Returns the offset into the array returned by `array` of the first element of the buffer (optional operation).
`abstract CharBuffer`	`asReadOnlyBuffer()` Returns a read-only buffer that shares its content with this buffer.
`char`	`charAt(int index)` Returns the character located at the specified index in the buffer.
`abstract CharBuffer`	`compact()` Compacts this char buffer.
`int`	`compareTo(CharBuffer otherBuffer)` Compare the remaining chars of this buffer to another char buffer's remaining chars.
`abstract CharBuffer`	`duplicate()` Returns a duplicated buffer that shares its content with this buffer.
`boolean`	`equals(Object other)` Checks whether this char buffer is equal to another object.
`abstract char`	`get()` Returns the char at the current position and increases the position by 1.
`CharBuffer`	`get(char[] dst)` Reads chars from the current position into the specified char array and increases the position by the number of chars read.
`CharBuffer`	`get(char[] dst, int dstOffset, int charCount)` Reads chars from the current position into the specified char array, starting from the specified offset, and increases the position by the number of chars read.
`abstract char`	`get(int index)` Returns a char at the specified index; the position is not changed.
`boolean`	`hasArray()` Returns true if `array` and `arrayOffset` won't throw.
`int`	`hashCode()` Calculates this buffer's hash code from the remaining chars.
`abstract boolean`	`isDirect()` Indicates whether this buffer is direct.
`int`	`length()` Returns the number of remaining chars.
`abstract ByteOrder`	`order()` Returns the byte order used by this buffer when converting chars from/to bytes.
`abstract CharBuffer`	`put(char c)` Writes the given char to the current position and increases the position by 1.
`CharBuffer`	`put(char[] src)` Writes chars from the given char array to the current position and increases the position by the number of chars written.
`CharBuffer`	`put(char[] src, int srcOffset, int charCount)` Writes chars from the given char array, starting from the specified offset, to the current position and increases the position by the number of chars written.
`CharBuffer`	`put(CharBuffer src)` Writes all the remaining chars of the `src` char buffer to this buffer's current position, and increases both buffers' position by the number of chars copied.
`abstract CharBuffer`	`put(int index, char c)` Writes a char to the specified index of this buffer; the position is not changed.
`CharBuffer`	`put(String str)` Writes all chars of the given string to the current position of this buffer, and increases the position by the length of string.
`CharBuffer`	`put(String str, int start, int end)` Writes chars of the given string to the current position of this buffer, and increases the position by the number of chars written.
`int`	`read(CharBuffer target)` Reads characters from this buffer and puts them into `target`.
`abstract CharBuffer`	`slice()` Returns a sliced buffer that shares its content with this buffer.
`abstract CharSequence`	`subSequence(int start, int end)` Returns a new char buffer representing a sub-sequence of this buffer's current remaining content.
`String`	`toString()` Returns a string representing the current remaining chars of this buffer.
`static CharBuffer`	`wrap(char[] array)` Creates a new char buffer by wrapping the given char array.
`static CharBuffer`	`wrap(char[] array, int start, int charCount)` Creates a new char buffer by wrapping the given char array.
`static CharBuffer`	`wrap(CharSequence chseq)` Creates a new char buffer by wrapping the given char sequence.
`static CharBuffer`	`wrap(CharSequence cs, int start, int end)` Creates a new char buffer by wrapping the given char sequence.

Methods inherited from class java.nio.Buffer
capacity, clear, flip, hasRemaining, isReadOnly, limit, limit, mark, position, position, remaining, reset, rewind

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Method Detail
  - allocate
```
public static CharBuffer allocate(int capacity)
```
    Creates a char buffer based on a newly allocated char array.
    
    Parameters:
    capacity - the capacity of the new buffer.
    
    Returns:
    the created char buffer.
    
    Throws:
    
    IllegalArgumentException - if capacity is less than zero.
  - wrap
```
public static CharBuffer wrap(char[] array)
```
    Creates a new char buffer by wrapping the given char array.
    Calling this method has the same effect as wrap(array, 0, array.length).
    
    Parameters:
    array - the char array which the new buffer will be based on.
    
    Returns:
    the created char buffer.
  - wrap
```
public static CharBuffer wrap(char[] array,
              int start,
              int charCount)
```
    Creates a new char buffer by wrapping the given char array.
    The new buffer's position will be start, limit will be start + charCount, capacity will be the length of the array.
    
    Parameters:
    array - the char array which the new buffer will be based on.
    start - the start index, must not be negative and not greater than array.length.
    charCount - the length, must not be negative and not greater than array.length - start.
    
    Returns:
    the created char buffer.
    
    Throws:
    
    IndexOutOfBoundsException - if either start or charCount is invalid.
  - wrap
```
public static CharBuffer wrap(CharSequence chseq)
```
    Creates a new char buffer by wrapping the given char sequence.
    Calling this method has the same effect as wrap(chseq, 0, chseq.length()).
    
    Parameters:
    chseq - the char sequence which the new buffer will be based on.
    
    Returns:
    the created char buffer.
  - wrap
```
public static CharBuffer wrap(CharSequence cs,
              int start,
              int end)
```
    Creates a new char buffer by wrapping the given char sequence.
    The new buffer's position will be start, limit will be end, capacity will be the length of the char sequence. The new buffer is read-only.
    
    Parameters:
    cs - the char sequence which the new buffer will be based on.
    start - the start index, must not be negative and not greater than cs.length().
    end - the end index, must be no less than start and no greater than cs.length().
    
    Returns:
    the created char buffer.
    
    Throws:
    
    IndexOutOfBoundsException - if either start or end is invalid.
  - array
```
public final char[] array()
```
    Description copied from class: Buffer
    
    Returns the array that backs this buffer (optional operation). The returned value is the actual array, not a copy, so modifications to the array write through to the buffer.
    Subclasses should override this method with a covariant return type to provide the exact type of the array.
    Use hasArray to ensure this method won't throw. (A separate call to isReadOnly is not necessary.)
    
    Specified by:
    
    array in class Buffer
    
    Returns:
    the array
  - arrayOffset
```
public final int arrayOffset()
```
    Description copied from class: Buffer
    
    Returns the offset into the array returned by array of the first element of the buffer (optional operation). The backing array (if there is one) is not necessarily the same size as the buffer, and position 0 in the buffer is not necessarily the 0th element in the array. Use buffer.array()[offset + buffer.arrayOffset() to access element offset in buffer.
    Use hasArray to ensure this method won't throw. (A separate call to isReadOnly is not necessary.)
    
    Specified by:
    
    arrayOffset in class Buffer
    
    Returns:
    the offset
  - asReadOnlyBuffer
```
public abstract CharBuffer asReadOnlyBuffer()
```
    Returns a read-only buffer that shares its content with this buffer.
    The returned buffer is guaranteed to be a new instance, even if this buffer is read-only itself. The new buffer's position, limit, capacity and mark are the same as this buffer's.
    The new buffer shares its content with this buffer, which means this buffer's change of content will be visible to the new buffer. The two buffer's position, limit and mark are independent.
    
    Returns:
    a read-only version of this buffer.
  - charAt
```
public final char charAt(int index)
```
    Returns the character located at the specified index in the buffer. The index value is referenced from the current buffer position.
    
    Specified by:
    
    charAt in interface CharSequence
    
    Parameters:
    index - the index referenced from the current buffer position. It must not be less than zero but less than the value obtained from a call to remaining().
    
    Returns:
    the character located at the specified index (referenced from the current position) in the buffer.
    
    Throws:
    
    IndexOutOfBoundsException - if the index is invalid.
  - compact
```
public abstract CharBuffer compact()
```
    Compacts this char buffer.
    The remaining chars will be moved to the head of the buffer, starting from position zero. Then the position is set to remaining(); the limit is set to capacity; the mark is cleared.
    
    Returns:
    this buffer.
    
    Throws:
    
    ReadOnlyBufferException - if no changes may be made to the contents of this buffer.
  - compareTo
```
public int compareTo(CharBuffer otherBuffer)
```
    Compare the remaining chars of this buffer to another char buffer's remaining chars.
    
    Specified by:
    
    compareTo in interface Comparable<CharBuffer>
    
    Parameters:
    otherBuffer - another char buffer.
    
    Returns:
    a negative value if this is less than otherBuffer; 0 if this equals to otherBuffer; a positive value if this is greater than otherBuffer.
    
    Throws:
    
    ClassCastException - if otherBuffer is not a char buffer.
  - duplicate
```
public abstract CharBuffer duplicate()
```
    Returns a duplicated buffer that shares its content with this buffer.
    The duplicated buffer's initial position, limit, capacity and mark are the same as this buffer's. The duplicated buffer's read-only property and byte order are the same as this buffer's, too.
    The new buffer shares its content with this buffer, which means either buffer's change of content will be visible to the other. The two buffer's position, limit and mark are independent.
    
    Returns:
    a duplicated buffer that shares its content with this buffer.
  - equals
```
public boolean equals(Object other)
```
    Checks whether this char buffer is equal to another object.
    If other is not a char buffer then false is returned. Two char buffers are equal if and only if their remaining chars are exactly the same. Position, limit, capacity and mark are not considered.
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    other - the object to compare with this char buffer.
    
    Returns:
    true if this char buffer is equal to other, false otherwise.
    See Also:
    Object.hashCode()
  - get
```
public abstract char get()
```
    Returns the char at the current position and increases the position by 1.
    
    Returns:
    the char at the current position.
    
    Throws:
    
    BufferUnderflowException - if the position is equal or greater than limit.
  - get
```
public CharBuffer get(char[] dst)
```
    Reads chars from the current position into the specified char array and increases the position by the number of chars read.
    Calling this method has the same effect as get(dst, 0, dst.length).
    
    Parameters:
    dst - the destination char array.
    
    Returns:
    this buffer.
    
    Throws:
    
    BufferUnderflowException - if dst.length is greater than remaining().
  - get
```
public CharBuffer get(char[] dst,
             int dstOffset,
             int charCount)
```
    Reads chars from the current position into the specified char array, starting from the specified offset, and increases the position by the number of chars read.
    
    Parameters:
    dst - the target char array.
    dstOffset - the offset of the char array, must not be negative and not greater than dst.length.
    charCount - The number of chars to read, must be no less than zero and no greater than dst.length - dstOffset.
    
    Returns:
    this buffer.
    
    Throws:
    
    IndexOutOfBoundsException - if either dstOffset or charCount is invalid.
    
    BufferUnderflowException - if charCount is greater than remaining().
  - get
```
public abstract char get(int index)
```
    Returns a char at the specified index; the position is not changed.
    
    Parameters:
    index - the index, must not be negative and less than limit.
    
    Returns:
    a char at the specified index.
    
    Throws:
    
    IndexOutOfBoundsException - if index is invalid.
  - hasArray
```
public final boolean hasArray()
```
    Description copied from class: Buffer
    
    Returns true if array and arrayOffset won't throw. This method does not return true for buffers not backed by arrays because the other methods would throw UnsupportedOperationException, nor does it return true for buffers backed by read-only arrays, because the other methods would throw ReadOnlyBufferException.
    
    Specified by:
    
    hasArray in class Buffer
  - hashCode
```
public int hashCode()
```
    Calculates this buffer's hash code from the remaining chars. The position, limit, capacity and mark don't affect the hash code.
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    the hash code calculated from the remaining chars.
    See Also:
    Object.equals(java.lang.Object)
  - isDirect
```
public abstract boolean isDirect()
```
    Indicates whether this buffer is direct. A direct buffer will try its best to take advantage of native memory APIs and it may not stay in the Java heap, so it is not affected by garbage collection.
    A char buffer is direct if it is based on a byte buffer and the byte buffer is direct.
    
    Specified by:
    
    isDirect in class Buffer
    
    Returns:
    true if this buffer is direct, false otherwise.
  - length
```
public final int length()
```
    Returns the number of remaining chars.
    
    Specified by:
    
    length in interface CharSequence
    
    Returns:
    the number of remaining chars.
  - order
```
public abstract ByteOrder order()
```
    Returns the byte order used by this buffer when converting chars from/to bytes.
    If this buffer is not based on a byte buffer, then this always returns the platform's native byte order.
    
    Returns:
    the byte order used by this buffer when converting chars from/to bytes.
  - put
```
public abstract CharBuffer put(char c)
```
    Writes the given char to the current position and increases the position by 1.
    
    Parameters:
    c - the char to write.
    
    Returns:
    this buffer.
    
    Throws:
    
    BufferOverflowException - if position is equal or greater than limit.
    
    ReadOnlyBufferException - if no changes may be made to the contents of this buffer.
  - put
```
public final CharBuffer put(char[] src)
```
    Writes chars from the given char array to the current position and increases the position by the number of chars written.
    Calling this method has the same effect as put(src, 0, src.length).
    
    Parameters:
    src - the source char array.
    
    Returns:
    this buffer.
    
    Throws:
    
    BufferOverflowException - if remaining() is less than src.length.
    
    ReadOnlyBufferException - if no changes may be made to the contents of this buffer.
  - put
```
public CharBuffer put(char[] src,
             int srcOffset,
             int charCount)
```
    Writes chars from the given char array, starting from the specified offset, to the current position and increases the position by the number of chars written.
    
    Parameters:
    src - the source char array.
    srcOffset - the offset of char array, must not be negative and not greater than src.length.
    charCount - the number of chars to write, must be no less than zero and no greater than src.length - srcOffset.
    
    Returns:
    this buffer.
    
    Throws:
    
    BufferOverflowException - if remaining() is less than charCount.
    
    IndexOutOfBoundsException - if either srcOffset or charCount is invalid.
    
    ReadOnlyBufferException - if no changes may be made to the contents of this buffer.
  - put
```
public CharBuffer put(CharBuffer src)
```
    Writes all the remaining chars of the src char buffer to this buffer's current position, and increases both buffers' position by the number of chars copied.
    
    Parameters:
    src - the source char buffer.
    
    Returns:
    this buffer.
    
    Throws:
    
    BufferOverflowException - if src.remaining() is greater than this buffer's remaining().
    
    IllegalArgumentException - if src is this buffer.
    
    ReadOnlyBufferException - if no changes may be made to the contents of this buffer.
  - put
```
public abstract CharBuffer put(int index,
             char c)
```
    Writes a char to the specified index of this buffer; the position is not changed.
    
    Parameters:
    index - the index, must be no less than zero and less than the limit.
    c - the char to write.
    
    Returns:
    this buffer.
    
    Throws:
    
    IndexOutOfBoundsException - if index is invalid.
    
    ReadOnlyBufferException - if no changes may be made to the contents of this buffer.
  - put
```
public final CharBuffer put(String str)
```
    Writes all chars of the given string to the current position of this buffer, and increases the position by the length of string.
    Calling this method has the same effect as put(str, 0, str.length()).
    
    Parameters:
    str - the string to write.
    
    Returns:
    this buffer.
    
    Throws:
    
    BufferOverflowException - if remaining() is less than the length of string.
    
    ReadOnlyBufferException - if no changes may be made to the contents of this buffer.
  - put
```
public CharBuffer put(String str,
             int start,
             int end)
```
    Writes chars of the given string to the current position of this buffer, and increases the position by the number of chars written.
    
    Parameters:
    str - the string to write.
    start - the first char to write, must not be negative and not greater than str.length().
    end - the last char to write (excluding), must be less than start and not greater than str.length().
    
    Returns:
    this buffer.
    
    Throws:
    
    BufferOverflowException - if remaining() is less than end - start.
    
    IndexOutOfBoundsException - if either start or end is invalid.
    
    ReadOnlyBufferException - if no changes may be made to the contents of this buffer.
  - slice
```
public abstract CharBuffer slice()
```
    Returns a sliced buffer that shares its content with this buffer.
    The sliced buffer's capacity will be this buffer's remaining(), and its zero position will correspond to this buffer's current position. The new buffer's position will be 0, limit will be its capacity, and its mark is cleared. The new buffer's read-only property and byte order are same as this buffer.
    The new buffer shares its content with this buffer, which means either buffer's change of content will be visible to the other. The two buffer's position, limit and mark are independent.
    
    Returns:
    a sliced buffer that shares its content with this buffer.
  - subSequence
```
public abstract CharSequence subSequence(int start,
                       int end)
```
    Returns a new char buffer representing a sub-sequence of this buffer's current remaining content.
    The new buffer's position will be position() + start, limit will be position() + end, capacity will be the same as this buffer. The new buffer's read-only property and byte order are the same as this buffer.
    The new buffer shares its content with this buffer, which means either buffer's change of content will be visible to the other. The two buffer's position, limit and mark are independent.
    
    Specified by:
    
    subSequence in interface CharSequence
    
    Parameters:
    start - the start index of the sub-sequence, referenced from the current buffer position. Must not be less than zero and not greater than the value obtained from a call to remaining().
    end - the end index of the sub-sequence, referenced from the current buffer position. Must not be less than start and not be greater than the value obtained from a call to remaining().
    
    Returns:
    a new char buffer represents a sub-sequence of this buffer's current remaining content.
    
    Throws:
    
    IndexOutOfBoundsException - if either start or end is invalid.
  - toString
```
public String toString()
```
    Returns a string representing the current remaining chars of this buffer.
    
    Specified by:
    
    toString in interface CharSequence
    
    Overrides:
    
    toString in class Buffer
    
    Returns:
    a printable representation of this object.
  - append
```
public CharBuffer append(char c)
```
    Writes the given char to the current position and increases the position by 1.
    
    Specified by:
    
    append in interface Appendable
    
    Parameters:
    c - the char to write.
    
    Returns:
    this buffer.
    
    Throws:
    
    BufferOverflowException - if position is equal or greater than limit.
    
    ReadOnlyBufferException - if no changes may be made to the contents of this buffer.
  - append
```
public CharBuffer append(CharSequence csq)
```
    Writes all chars of the given character sequence csq to the current position of this buffer, and increases the position by the length of the csq.
    Calling this method has the same effect as append(csq.toString()). If the CharSequence is null the string "null" will be written to the buffer.
    
    Specified by:
    
    append in interface Appendable
    
    Parameters:
    csq - the CharSequence to write.
    
    Returns:
    this buffer.
    
    Throws:
    
    BufferOverflowException - if remaining() is less than the length of csq.
    
    ReadOnlyBufferException - if no changes may be made to the contents of this buffer.
  - append
```
public CharBuffer append(CharSequence csq,
                int start,
                int end)
```
    Writes chars of the given CharSequence to the current position of this buffer, and increases the position by the number of chars written.
    
    Specified by:
    
    append in interface Appendable
    
    Parameters:
    csq - the CharSequence to write.
    start - the first char to write, must not be negative and not greater than csq.length().
    end - the last char to write (excluding), must be less than start and not greater than csq.length().
    
    Returns:
    this buffer.
    
    Throws:
    
    BufferOverflowException - if remaining() is less than end - start.
    
    IndexOutOfBoundsException - if either start or end is invalid.
    
    ReadOnlyBufferException - if no changes may be made to the contents of this buffer.
  - read
```
public int read(CharBuffer target)
         throws IOException
```
    Reads characters from this buffer and puts them into target. The number of chars that are copied is either the number of remaining chars in this buffer or the number of remaining chars in target, whichever is smaller.
    
    Specified by:
    
    read in interface Readable
    
    Parameters:
    target - the target char buffer.
    
    Returns:
    the number of chars copied or -1 if there are no chars left to be read from this buffer.
    
    Throws:
    
    IllegalArgumentException - if target is this buffer.
    
    IOException - if an I/O error occurs.
    
    ReadOnlyBufferException - if no changes may be made to the contents of target.

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IT. Expert System.

Android Reference

CharBuffer

Class CharBuffer

Method Summary

Methods inherited from class java.nio.Buffer

Methods inherited from class java.lang.Object

Method Detail

allocate

wrap

wrap

wrap

wrap

array

arrayOffset

asReadOnlyBuffer

charAt

compact

compareTo

duplicate

equals

get

get

get

get

hasArray

hashCode

isDirect

length

order

put

put

put

put

put

put

put

slice

subSequence

toString

append

append

append

read

Android Reference

Java basics

Java Enterprise Edition (EE)

Java Standard Edition (SE)

SQL

HTML

PHP

CSS

Java Script

MYSQL

JQUERY

VBS

REGEX

C

C++

C#

Design patterns

RFC (standard status)

RFC (proposed standard status)

RFC (draft standard status)

RFC (informational status)

RFC (experimental status)

RFC (best current practice status)

RFC (historic status)

RFC (unknown status)

IT dictionary