java.io
Class CharArrayWriter

java.lang.Object
  java.io.Writer
      java.io.CharArrayWriter

All Implemented Interfaces:

Closeable, Flushable, Appendable

public class CharArrayWriter
extends Writer

This class implements a character buffer that can be used as an Writer. The buffer automatically grows when data is written to the stream. The data can be retrieved using toCharArray() and toString().

Note: Invoking close() on this class has no effect, and methods of this class can be called after the stream has closed without generating an IOException.

Since:

JDK1.1

Field Summary

protected char[]	buf The buffer where data is stored.
protected int	count The number of chars in the buffer.

Fields inherited from class java.io.Writer

lock

Constructor Summary

CharArrayWriter()
Creates a new CharArrayWriter.

CharArrayWriter(int initialSize)
Creates a new CharArrayWriter with the specified initial size.

Method Summary

CharArrayWriter	append(char c) Appends the specified character to this writer.
CharArrayWriter	append(CharSequence csq) Appends the specified character sequence to this writer.
CharArrayWriter	append(CharSequence csq, int start, int end) Appends a subsequence of the specified character sequence to this writer.
void	close() Close the stream.
void	flush() Flush the stream.
void	reset() Resets the buffer so that you can use it again without throwing away the already allocated buffer.
int	size() Returns the current size of the buffer.
char[]	toCharArray() Returns a copy of the input data.
String	toString() Converts input data to a string.
void	write(char[] c, int off, int len) Writes characters to the buffer.
void	write(int c) Writes a character to the buffer.
void	write(String str, int off, int len) Write a portion of a string to the buffer.
void	writeTo(Writer out) Writes the contents of the buffer to another character stream.

Methods inherited from class java.io.Writer

write, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

buf

protected char[] buf

The buffer where data is stored.

count

protected int count

The number of chars in the buffer.

Constructor Detail

CharArrayWriter

public CharArrayWriter()

Creates a new CharArrayWriter.

CharArrayWriter

public CharArrayWriter(int initialSize)

Creates a new CharArrayWriter with the specified initial size.

Parameters:

initialSize - an int specifying the initial buffer size.

Throws:

IllegalArgumentException - if initialSize is negative

Method Detail

write

public void write(int c)

Writes a character to the buffer.

Overrides:

write in class Writer

Parameters:

c - int specifying a character to be written.

write

public void write(char[] c,
                  int off,
                  int len)

Writes characters to the buffer.

Specified by:

write in class Writer

Parameters:

c - the data to be written

off - the start offset in the data

len - the number of chars that are written

write

public void write(String str,
                  int off,
                  int len)

Write a portion of a string to the buffer.

Overrides:

write in class Writer

Parameters:

str - String to be written from

off - Offset from which to start reading characters

len - Number of characters to be written

writeTo

public void writeTo(Writer out)
             throws IOException

Writes the contents of the buffer to another character stream.

Parameters:

out - the output stream to write to

Throws:

IOException - If an I/O error occurs.