import javax.swing.JOptionPane;

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

JOptionPane.showInputDialog(
"Enter first integer");

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);
}
}




谢谢啦