Pattern Question

Write a program for pattern:

1 2 3 4 5
6 7 8 9
10 11 12
13 14
15

import java.io.*;

class Pattern

{

    public static void main(String args[])

    {

        int a = 1;

        for(int i = 5; i>=1; i--)

        {

            for(int j = 1; j<=i; j++)

            {

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

                a++;

            }

            System.out.println();

        }

    }

}