import javax.swing.JOptionPane;      // include GUI class called "JOptionPane"
import java.util.Scanner;        

/** Let's make a very simple Graphical User Interface -- pop up windows
 *  that do input and output.  Let's multiply 2 numbers.
 *  For more information on JOptionPane, go to the API Web site
 *  java.sun.com/j2se/1.5.0/docs/api, and scroll down to the JOptionPane link.
 */
public class TinyGUI
{
  public static void main(String [] args)
  {
    // Get input string from a pop-up window
    String input = JOptionPane.showInputDialog("Enter 2 numbers separated by a space");

    // Parse the string with StringTokenizer to get the 2 numbers
    Scanner inputScanner = new Scanner(input);
    int first = inputScanner.nextInt();
    int second = inputScanner.nextInt();

    // Now we're ready to multiply and give result.
    // It turns out that the showMessageDialog() function requires 2 parameters:
    // 1.  the name of a frame (in this case there isn't one so we say "null")
    // 2.  a String to print
    String answer = "The product of " + first + " and " + second +
                    " is " + (first * second) + ".";
    JOptionPane.showMessageDialog(null, answer);
  }
}