Uses of Class java.nio.CharBuffer (Java Platform SE 8 )
Date: 2026-03-16

## Uses of Class
java.nio.CharBuffer

- Packages that use CharBuffer
  Package | Description
  --- | ---
  java.io | Provides for system input and output through data streams, serialization and the file system.
  java.lang | Provides classes that are fundamental to the design of the Java programming language.
  java.nio | Defines buffers, which are containers for data, and provides an overview of the other NIO packages.
  java.nio.charset | Defines charsets, decoders, and encoders, for translating between bytes and Unicode characters.

- - ### Uses of CharBuffer in java.io

    Methods in java.io with parameters of type CharBuffer
    Modifier and Type | Method and Description
    --- | ---
    `int` | Reader.`read(CharBuffer target)` Attempts to read characters into the specified character buffer.

  - ### Uses of CharBuffer in java.lang

    Methods in java.lang with parameters of type CharBuffer
    Modifier and Type | Method and Description
    --- | ---
    `int` | Readable.`read(CharBuffer cb)` Attempts to read characters into the specified character buffer.

  - ### Uses of CharBuffer in java.nio

    Methods in java.nio that return CharBuffer
    Modifier and Type | Method and Description
    --- | ---
    `static CharBuffer` | CharBuffer.`allocate(int capacity)` Allocates a new char buffer.
    `CharBuffer` | CharBuffer.`append(char c)` Appends the specified char to this buffer (optional operation).
    `CharBuffer` | CharBuffer.`append(CharSequence csq)` Appends the specified character sequence to this buffer (optional operation).
    `CharBuffer` | CharBuffer.`append(CharSequence csq, int start, int end)` Appends a subsequence of the specified character sequence to this buffer (optional operation).
    `abstract CharBuffer` | ByteBuffer.`asCharBuffer()` Creates a view of this byte buffer as a char buffer.
    `abstract CharBuffer` | CharBuffer.`asReadOnlyBuffer()` Creates a new, read-only char buffer that shares this buffer's content.
    `abstract CharBuffer` | CharBuffer.`compact()` Compacts this buffer (optional operation).
    `abstract CharBuffer` | CharBuffer.`duplicate()` Creates a new char buffer that shares this buffer's content.
    `CharBuffer` | CharBuffer.`get(char[] dst)` Relative bulk get method.
    `CharBuffer` | CharBuffer.`get(char[] dst, int offset, int length)` Relative bulk get method.
    `abstract CharBuffer` | CharBuffer.`put(char c)` Relative put method (optional operation).
    `CharBuffer` | CharBuffer.`put(char[] src)` Relative bulk put method (optional operation).
    `CharBuffer` | CharBuffer.`put(char[] src, int offset, int length)` Relative bulk put method (optional operation).
    `CharBuffer` | CharBuffer.`put(CharBuffer src)` Relative bulk put method (optional operation).
    `abstract CharBuffer` | CharBuffer.`put(int index, char c)` Absolute put method (optional operation).
    `CharBuffer` | CharBuffer.`put(String src)` Relative bulk put method (optional operation).
    `CharBuffer` | CharBuffer.`put(String src, int start, int end)` Relative bulk put method (optional operation).
    `abstract CharBuffer` | CharBuffer.`slice()` Creates a new char buffer whose content is a shared subsequence of this buffer's content.
    `abstract CharBuffer` | CharBuffer.`subSequence(int start, int end)` Creates a new character buffer that represents the specified subsequence of this buffer, relative to the current position.
    `static CharBuffer` | CharBuffer.`wrap(char[] array)` Wraps a char array into a buffer.
    `static CharBuffer` | CharBuffer.`wrap(char[] array, int offset, int length)` Wraps a char array into a buffer.
    `static CharBuffer` | CharBuffer.`wrap(CharSequence csq)` Wraps a character sequence into a buffer.
    `static CharBuffer` | CharBuffer.`wrap(CharSequence csq, int start, int end)` Wraps a character sequence into a buffer.

    Methods in java.nio with parameters of type CharBuffer
    Modifier and Type | Method and Description
    --- | ---
    `int` | CharBuffer.`compareTo(CharBuffer that)` Compares this buffer to another.
    `CharBuffer` | CharBuffer.`put(CharBuffer src)` Relative bulk put method (optional operation).
    `int` | CharBuffer.`read(CharBuffer target)` Attempts to read characters into the specified character buffer.

  - ### Uses of CharBuffer in java.nio.charset

    Methods in java.nio.charset that return CharBuffer
    Modifier and Type | Method and Description
    --- | ---
    `CharBuffer` | Charset.`decode(ByteBuffer bb)` Convenience method that decodes bytes in this charset into Unicode characters.
    `CharBuffer` | CharsetDecoder.`decode(ByteBuffer in)` Convenience method that decodes the remaining content of a single input byte buffer into a newly-allocated character buffer.

    Methods in java.nio.charset with parameters of type CharBuffer
    Modifier and Type | Method and Description
    --- | ---
    `CoderResult` | CharsetDecoder.`decode(ByteBuffer in, CharBuffer out, boolean endOfInput)` Decodes as many bytes as possible from the given input buffer, writing the results to the given output buffer.
    `protected abstract CoderResult` | CharsetDecoder.`decodeLoop(ByteBuffer in, CharBuffer out)` Decodes one or more bytes into one or more characters.
    `ByteBuffer` | CharsetEncoder.`encode(CharBuffer in)` Convenience method that encodes the remaining content of a single input character buffer into a newly-allocated byte buffer.
    `ByteBuffer` | Charset.`encode(CharBuffer cb)` Convenience method that encodes Unicode characters into bytes in this charset.
    `CoderResult` | CharsetEncoder.`encode(CharBuffer in, ByteBuffer out, boolean endOfInput)` Encodes as many characters as possible from the given input buffer, writing the results to the given output buffer.
    `protected abstract CoderResult` | CharsetEncoder.`encodeLoop(CharBuffer in, ByteBuffer out)` Encodes one or more characters into one or more bytes.
    `CoderResult` | CharsetDecoder.`flush(CharBuffer out)` Flushes this decoder.
    `protected CoderResult` | CharsetDecoder.`implFlush(CharBuffer out)` Flushes this decoder.

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