SourceSum

import javax.swing.JOptionPane;

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

          firstNumber =
            JOptionPane.showInputDialog("enter first number");

            secondNumber =
              JOptionPane.showInputDialog("enter second number");

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

              sum = number1 + number2;

              JOptionPane.showMessageDialog(
                null, "the sum is" + sum, "results",
                JOptionPane.PLAIN_MESSAGE);

                System.exit(0);
                }

                }