java.io
Class CharArrayWriter

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

All Implemented Interfaces:

Appendable , Closeable

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
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
append , append , 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.

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

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.

reset

public void reset()

Resets the buffer so that you can use it again without throwing away the already allocated buffer.

toCharArray

public char[] toCharArray()

Returns a copy of the input data.

Returns:

an array of chars copied from the input data.

size

public int size()

Returns the current size of the buffer.

Returns:

an int representing the current size of the buffer.

toString

public String toString()

Converts input data to a string.

Overrides:

toString in class Object

Returns:

the string.

flush

public void flush()

Flush the stream.

Specified by:

flush in class Writer

close

public void close()

Close the stream. This method does not release the buffer, since its contents might still be required. Note: Invoking this method in this class will have no effect.

Specified by:

close in interface Closeable

Specified by:

close in class Writer