A CharBuffer works pretty much the same as an IntBuffer, a DoubleBuffer, a LongBuffer, and any of the other multibyte buffer types. That is, it has absolute and relative put methods that put chars; absolute and relative get methods that get chars; bulk put and get methods that put and get arrays of chars; and methods to flip, clear, rewind, and so forth. CharBuffer also has some convenience methods that operate on CharSequences (usually Strings, but also StringBuffers, StringBuilders, and so on). Furthermore, the CharBuffer class itself implements CharSequence, so you can pass it to methods such as Java 6's Normalizer.isNormalized( ), query it with regular expressions, and generally use it as you would any string.

A CharBuffer can be created in the three usual ways: by allocation, by wrapping a preexisting char[] array, or as a view of a ByteBuffer. A CharBuffer can also be created by wrapping a CharSequence:

public static CharBuffer wrap(CharSequence sequence)

or from a subsequence beginning at a certain offset and continuing to a certain point:

public static CharBuffer wrap(CharSequence sequence, int start, int end)

Because CharSequence is a read-only interface (i.e., it has no setter methods), the buffers created in this way are also read-only. You can get from them, but you can't put into them. Attempting to do so throws a ReadOnlyBufferException.

Basic I/O

Introducing I/O

Output Streams

Input Streams

Data Sources

File Streams

Network Streams

Filter Streams

Filter Streams

Print Streams

Data Streams

Streams in Memory

Compressing Streams

JAR Archives

Cryptographic Streams

Object Serialization

New I/O



Nonblocking I/O

The File System

Working with Files

File Dialogs and Choosers


Character Sets and Unicode

Readers and Writers

Formatted I/O with java.text


The Java Communications API


The J2ME Generic Connection Framework


Character Sets

Java I/O
Java I/O
ISBN: 0596527500
EAN: 2147483647
Year: 2004
Pages: 244 © 2008-2020.
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