使用确认对话框控制循环

import java.util.*;
import javax.swing.*;  
  class Main {
    public static void main(String[] args){
      int sum = 0;

      //Keep reading data until the user answer No
      int option = JOptionPane.YES_OPTION;
      while(option == JOptionPane.YES_OPTION){
        //Read the next data
        String dataString = JOptionPane.showInputDialog("Enter an int value: ");
        int data = Integer.parseInt(dataString);
        sum += data;
        option = JOptionPane.showConfirmDialog(null,"Continue?");
    }
      JOptionPane.showMessageDialog(null, "The sum is " + sum);
  }
}