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java.io
Class CharArrayWriter


java.lang.Object
  extended by java.io.Writer
      extended by 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.

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.

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