Pattern Question

Write a program on following pattern :-
15 14 13 12 11
10 9 8 7
6 5 4
3 2
1

import java.io.*;

class Pattern

{

    public static void main(String args[])

    {

        int a = 15;

        for(int i = 5; i>=1; i--)

        {

            for(int j = 1; j<=i; j++)

            {

                System.out.print(a+"\t");

                a--;

            }

            System.out.println();

        }

    }

}