import javax.swing.JOptionPane;

public class Addition
{

    public static void main(String[] args)
    {
        String firstNumber;
        String secondNumber;
        int number1;
        int number2;
        int sum;
        
        firstNumber = JOptionPane.showInputDialog(”First Num“);//出错位置
        secondNumber = JOptionPane.showInputDialog(”Second Num“)//出错位置
        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);
    }

}