lesson7 事件监听2- 启停

 

 

 

 

package com.zym.lesson7;

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 TestActionEvent2 {

    public static void main(String[] args) {

        Frame frame=new Frame("课堂练习，事件监听启动、停止");


        //按钮按下，触发事件
          Button btn_start=new Button("start");
          Button btn_stop =new Button("stop");

          btn_start.setActionCommand("start");
          btn_stop.setActionCommand("stop");

        frame.add(btn_start);
        frame.add(btn_stop);
       //它需要 一个监听addActionListener，所以建一个类去实现

        MyActonListener2 myActonListener2=new MyActonListener2();

        //两个按钮共同实现了这个事件
        btn_start.addActionListener(myActonListener2);
        btn_stop.addActionListener(myActonListener2);





        //设置流式布局  默认是靠中
        frame.setLayout(new FlowLayout());

        frame.setSize(200,200);

        frame.setVisible(true);

        frame.addWindowListener(new WindowAdapter() {
                                    //窗体关闭时做的事
                                    @Override
                                    public void windowClosing(WindowEvent e) {
                                        // super.windowClosed(e);
                                        System.exit(0);
                                    }
                                }
        );
    }
}

class MyActonListener2 implements ActionListener{

    @Override
    public void actionPerformed(ActionEvent e) {
        e.getActionCommand();


        System.out.println("aaaaaa"+e.getActionCommand());

        if(e.getActionCommand().equals("start")){
            System.out.println("motor start !");
        }
        if(e.getActionCommand().equals("stop")){
            System.out.println("\"motor stop !");
        }
    }
}