窗口关闭的问题

[dxhxiaotian411]

各位请帮个忙,我作了一个类似于windows记事本一样的程序,想在关闭窗口时弹出是否保存,可是我现在点击是和否都会关闭,我在windowclosing事件中写的

[mq612]

import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class Test extends JFrame {

public Test() {
super("Test");
this.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent arg0) {
int i=JOptionPane.showConfirmDialog(null,"是否关闭程序","系统提示",JOptionPane.YES_NO_OPTION,JOptionPane.QUESTION_MESSAGE);
if(i == JOptionPane.YES_OPTION){
System.exit(0); // 退出系统
}else if(i == JOptionPane.NO_OPTION){
System.out.println("不退出系统");
}
}});
this.setSize(300, 200);
this.setVisible(true);
}

public static void main(String[] arg) {
new Test();
}

}

[dxhxiaotian411]

谢谢,奉上分数