Java Programming Tutorial - Graphical User Interface GUI

import javax.swing.JOptionPane;

public class Coffee{

public static void main(String arg[]) { 

String fn = JOptionPane.showInputDialog("Enter first number"); 

String sn = JOptionPane.showInputDialog("Enter second number"); 

int num1 = Integer.parseInt(fn);

int num2 = Integer.parseInt(sn);

int sum = num1 + num2; 

JOptionPane.showMessageDialog(null, "The answer is " +sum, "the title", JOptionPane.PLAIN_MESSAGE );

}

}