The class implements a character buffer that can be used as an Writer. The buffer automatically grows when data is written to the stream.

Class declaration

Following is the declaration for class −

public class CharArrayWriter
   extends Writer


Following are the fields for class −

  • protected char[] buf − This is the buffer where data is stored.

  • protected int count − This is the number of chars in the buffer.

  • protected Object lock − This is the object used to synchronize operations on this stream.

Class constructors

Sr.No. Constructor & Description


This creates a CharArrayReader from the specified array of chars.


CharArrayWriter(int initialSize)

This creates a new CharArrayWriter with the specified initial size.

Class methods

Sr.No. Method & Description
1 CharArrayWriter append(char c)

This method appends the specified character to this writer.

2 CharArrayWriter append(CharSequence csq)

This method appends the specified character sequence to this writer.

3 CharArrayWriter append(CharSequence csq, int start, int end)

This method appends a subsequence of the specified character sequence to this writer.

4 void close()

This method close the stream.

5 void flush()

This method flush the stream.

6 void reset()

This method resets the buffer so that you can use it again without throwing away the already allocated buffer.


int size()

This method returns the current size of the buffer.

8 char[] toCharArray()

This method returns a copy of the input data.

9 String toString()

This method converts input data to a string.

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

This method writes characters to the buffer.

11 void write(int c)

This method writes a character to the buffer.

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

This method write a portion of a string to the buffer.

13 void writeTo(Writer out)

This method writes the contents of the buffer to another character stream.

Methods inherited

This class inherits methods from the following classes −