The I/O Package - The Java Programming Language - page 771

public CharArrayWriter()
Creates a new CharArrayWriter with a default initial array size.
public CharArrayWriter(int size)
Creates a new CharArrayWriter with the given initial array size.
public int size()
Returns the number of characters generated thus far by out-
put to the stream.
public char[] toCharArray()
Returns a copy of the characters generated thus far by output
to the stream. When you are finished writing into a CharAr-
rayWriter via upstream filter streams, you should flush the up-
stream objects before using toCharArray .
public void reset()
Resets the stream to reuse the current buffer, discarding its
contents.
public String toString()
Returns the current contents of the buffer as a String .
public void writeTo(Writer out) tHRows IOException
Writes the current contents of the buffer to the stream out .