Java.io.CharArrayWriter class in Java | Set 2

CharArrayWriter class in Java | Set 1

Methods:

• append (char Sw) : java.io.CharArrayWriter.append(char Sw) appends a single character to the Writer.
  Syntax:
  
  

  public CharArrayWriter append(char Sw)
  Parameters : 
  Sw : character to be append
  Return  :
  CharArrayWriter

• append (CharSequence char_sq) : java.io.CharArrayWriter.append(CharSequence char_sq) appends specified character sequence to the Writer.
  Syntax:

  public CharArrayWriter append(CharSequence char_sq)
  Parameters : 
  char_sq : Character sequence to append. 
  Return  :
  CharArrayWriter, if char sequence is null, then NULL appends to the Writer. 

• append (CharSequence char_sq, int start, int end) : java.io.CharArrayWriter.append(CharSequence char_sq, int start, int end) appends specified part of a character sequence to the Writer.
  Syntax:

  public CharArrayWriter append(CharSequence char_sq, int start, int end)
  Parameters : 
  char_sq : Character sequence to append.
  start : start of character in the Char Sequence
  end : end of character in the Char Sequence
  Return  :
  void

• flush() : java.io.CharArrayWriter.flush() flushes the Writer stream
  Syntax:

  public void flush()
  Parameters : 
  -----
  Return  :
  void

• toCharArray() : java.io.CharArrayWriter.toCharArray() returns character array from the Writer Stream.
  Syntax:

  public char[] toCharArray()
  Parameters : 
  -----
  Return  :
  void

• reset() : java.io.CharArrayWriter.reset() resets the Writer buffer so that it can be used again.
  Syntax:

  public void reset()
  Parameters : 
  -----
  Return  :
  void

Java program illustrating use of CharArrayWriter class methods :

// Java program illustrating the working of CharArrayWriter class methods
// append(CharSequence char_sq), append(char Sw)
// append(CharSequence char_sq, int start,int end)
// flush(), reset(), toCharArray

import java.io.*;

public class NewClass
{
    public static void main(String[] args) throws IOException
    {
        // Initializing String Witer
        CharArrayWriter geek_writer1 = new CharArrayWriter();
        CharArrayWriter geek_writer2 = new CharArrayWriter();
        CharArrayWriter geek_writer3 = new CharArrayWriter();

        char[] Sw = {'G','E','E','K','S'};

        for(char c: Sw)
        {
            // Use of append(char Sw) :
            geek_writer1 .append(c);

            System.out.println("append(char Sw) :" + geek_writer1 .toString());
        }

        // Using flush() method
        geek_writer1.flush();
        System.out.println("\nUsing flush() : "+ geek_writer1.toString());
        System.out.println("");


        // Initializing Character Sequence
        CharSequence char_sq1 = "1 Hello 1";
        CharSequence char_sq2 = " : 2 Geeks 2";

        // Use of append(CharSequence char_sq)
        geek_writer2.append(char_sq1);
        geek_writer2.append(char_sq2);

        System.out.println("append(char_sq) : " + geek_writer2.toString());

        // Use of append(CharSequence char_sq,int start,int end)
        geek_writer3.append(char_sq1, 0, 3);
        geek_writer3.append(char_sq2, 3, 6);

        System.out.println("append(char_sq,start,end) : " + geek_writer3.toString());
        System.out.println("");


        // Use of toCharArray() :
        char[] toChar1 = geek_writer1.toCharArray();
        for (char c1 : toChar1)
        {
            System.out.println("toCharArray : "+ c1);
        }

        geek_writer1.reset();
        System.out.println("\nReset is invoked");


        char[] toChar2 = geek_writer1.toCharArray();
        for (char c2 : toChar2)
        {
            System.out.println("toCharArray : "+ c2);
        }


        System.out.println("\ntoCharArray not working as reset is invoked");
    }
}

Output :

append(char Sw) :G
append(char Sw) :GE
append(char Sw) :GEE
append(char Sw) :GEEK
append(char Sw) :GEEKS

Using flush() : GEEKS

append(char_sq) : 1 Hello 1 : 2 Geeks 2
append(char_sq,start,end) : 1 H2 G

toCharArray : G
toCharArray : E
toCharArray : E
toCharArray : K
toCharArray : S

Reset is invoked

toCharArray not working as reset is invoked