Towers of Hanoi - Programming Environment Lab - JAVA

Program:
import java.io.*;
class han
{
    public void phanoi(int n,int source,int temp,int destn)
    {
        if(n>0)
        {
            phanoi(n-1,source,destn,temp);
            System.out.println("move top disk from "+source+" to "+destn);
            phanoi(n-1,temp,source,destn);
        }

    }
}
class hanoi
{
public static void main (String arg[]) throws IOException
{
    DataInputStream x=new DataInputStream(System.in);
    System.out.print("enter no of disks: ");
    int n=Integer.parseInt(x.readLine());
    han ob=new han();
    ob.phanoi(n,1,2,3);
}
}
Output:
nn@ubuntu:~$ javac hanoi.java
nn@ubuntu:~$ java hanoi
enter no of disks:3
move top disk from 1 to 3
move top disk from 1 to 2
move top disk from 3 to 2
move top disk from 1 to 3
move top disk from 2 to 1
move top disk from 2 to 3
move top disk from 1 to 3
nn@ubuntu:~$