监听事件-2022-12-7

package com.lr.guifirstdemo;

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 testDemo06 {
    public static void main(String[] args) {
        Frame frame = new Frame();
        frame.setBounds(200,200,500,200);
        Button button = new Button("button-1");
        button.setBackground(Color.BLUE);

        MyActionListener myActionListener = new MyActionListener();
        button.addActionListener(myActionListener);

        frame.add(button,BorderLayout.CENTER);
        //frame.pack();

        WindowClose(frame);
        frame.setVisible(true);
    }

    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("aaa");
    }
}

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package com.lr.guifirstdemo;

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

public class testDemo07 {
    public static void main(String[] args) {
        Frame frame = new Frame("开始-停止");
        Button button1 = new Button("start");
        Button button2 = new Button("stop");

        //button2.setActionCommand("Button2-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);


    }
}

class MyMonitor implements ActionListener{

    @Override
    public void actionPerformed(ActionEvent e) {
        //获得按钮的信息
        System.out.println("按钮被点击了msg: "+e.getActionCommand());
        if (e.getActionCommand().equals("start")){
            System.out.println("I love you");
        }
        if (e.getActionCommand().equals("stop")){
            System.out.println("I hate you");
        }
    }
}
// 两个按钮公用一个监听事件，不需要每个按钮都写一个事件，提高效率