Question

java中如何实现当点击Frame框右上角那个×时自动询问“是否退出”？

Answer 1

import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.JOptionPane;

public class Test extends JFrame {

public Test(){
this.setTitle("title");
this.setSize(300,200);
this.setLocation(100,100);

//设置关闭时什么也不做
this.setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
//监听关闭按钮的点击操作
this.addWindowListener(new WindowAdapter(){
//new 一个WindowAdapter 类 重写windowClosing方法
//WindowAdapter是个适配器类 具体看jdk的帮助文档
public void windowClosing(WindowEvent e) {
//这里写对话框
if(JOptionPane.showConfirmDialog(null, "退出","提示",JOptionPane.YES_NO_OPTION,JOptionPane.QUESTION_MESSAGE)==JOptionPane.YES_OPTION){
System.exit(0);
}
}

});

this.setVisible(true);
}

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

}