// JOptionPane for inputing data

import java.awt.*;
import javax.swing.*;

class MyGUI3 {

    public static void main (String[] args) {

	JFrame mywindow = new JFrame ();
	mywindow.setSize (400, 400);
	mywindow.setTitle ("GUI13 Example");
	mywindow.setVisible(true);

	// To exit from the program by pressing the X button, 
	// the following statement must be included

	mywindow.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);

	// Reading data with JOptionPane class

	String a;
	a = JOptionPane.showInputDialog (mywindow, "Enter first number to add:");

	String b;
	b = JOptionPane.showInputDialog (mywindow, "Enter second number to add:");

	int a1, b1, result;

        a1 = Integer.parseInt(a);
	b1 = Integer.parseInt(b);

	result = a1 + b1;

	JOptionPane.showMessageDialog (mywindow, a1 + " + " + b1 + " = " + result);

    }
}