Random Access File Demo - Java Example Program

import java.io.*;

class RandomAccessFileDemo
{
    public static void main(String arg[])
    {
        try
        {
            String input = "Learn Java With Merit Campus";
            System.out.println("Input : " + input);
            RandomAccessFile raf = new RandomAccessFile("raf.txt", "rw");
            raf.writeBytes(input);
        
            // MOVE TO 6TH POSITION AND READ FOUR CHARACTERS
            raf.seek(6);
            String s = "" + (char) raf.read() + (char) raf.read() + (char) raf.read() + (char) raf.read();
            System.out.println("String read is : " + s);
        
            // CHANGE 'With' TO 'From' 
            raf.seek(11);
            raf.writeBytes("From");
            raf.seek(0);
            System.out.println("After changing : " + raf.readLine());
        
            // TRUNCATE TO 10 CHARACTERS
            raf.setLength(10);
            raf.seek(0);
            System.out.println("After truncating : " + raf.readLine());
        
            raf.close();
        }
        catch(IOException ioex)
        {
            System.out.println("Read write failed - " + ioex.getMessage());
        }    
    }
}