Java图形化界面GUI：事件监听

事件监听：当某个事情发生的时候，干什么！

 

package com.zdz.gui;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class TestActionEvent {
    public static void main(String[] args) {
        //Action1();
        Action2();
    }

    private static void Action1(){
        //按下按钮触发一些事件
        Frame frame = new Frame();
        Button button = new Button();
        //因为addActionListener()需要一个ActionListener，所以我们需要构造一个ActionListener
        MyActionListener myActionListener = new MyActionListener();
        button.addActionListener(myActionListener);

        frame.add(button,BorderLayout.CENTER);
        frame.pack();
        frame.setVisible(true);
        windowClose(frame);
    }

    private static void Action2(){
        //两个按钮实现同一个监听
        //开始 停止
        Frame frame = new Frame();
        Button button1 = new Button("start");
        Button button2 = new Button("stop");

        //set替代默认值
        button1.setActionCommand("button1-stop");

        MyMonitor myMonitor = new MyMonitor();
        button1.addActionListener(myMonitor);
        button2.addActionListener(myMonitor);

        frame.add(button1,BorderLayout.NORTH);
        frame.add(button2,BorderLayout.SOUTH);
        frame.pack();
        frame.setVisible(true);

        windowClose(frame);
    }

    //关闭窗口
    private static void windowClose(Frame frame){
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

}
class MyActionListener implements ActionListener{

    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println("aaaa");
    }
}

class MyMonitor implements ActionListener{

    @Override
    public void actionPerformed(ActionEvent e) {
        //e.getActionCommand()获得按钮信息
        System.out.println("按钮被点击了 msg:"+e.getActionCommand());
        if(e.getActionCommand().equals("button1-stop")){
            System.out.println("button1被点击了");
        }else {
            System.out.println("button2");
        }
    }
}