swing 자바 Addtion

[CODE type="java"]
import javax.swing.JOptionPane;

public class Addition
{
public static void main(String args[])
{
String firstNumber, secondNumber;
int number1, number2, sum;

firstNumber = JOptionPane.showInputDialog("Inter First Integer");

secondNumber = JOptionPane.showInputDialog("Enter Second Integer");

number1 = Integer.parseInt(firstNumber);
number2 = Integer.parseInt(secondNumber);

sum = number1 + number2;

JOptionPane.showMessageDialog(null, "The sum is " + sum, "Result", JOptionPane.PLAIN_MESSAGE);

System.exit(0);
}
}
[/HTML][/CODE]