[danielstoner]

Actually it works but not in the GUI. It works at the console.

Code:

import javax.swing.JOptionPane;

public class Ex6
{
    public static void main(String args[])
    {
        String msg;

        msg = "N\t10*N\t100*N\t1000*N\n\n"; // \t doesn't seem to be working for some reason...

        for (int i = 1; i <= 5; i++)
        {
            msg += String.format("%d\t%d\t%d\t%d\n", i, i * 10, i * 100, i * 1000);
        }

        System.out.println(msg);
        JOptionPane.showMessageDialog(null, msg);
    }
}