javagui

4、事件监听

一对一监听

package com.Icy.day02;

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) {
        Frame frame = new Frame();
        Button button = new Button();
        //addActionListener()需要一个ActionListener，所以需要构建一个ActionListener
        MyActionListener myActionListener = new MyActionListener();
        button.addActionListener(myActionListener);
        frame.add(button,BorderLayout.CENTER);
        frame.pack();
        windowClose(frame);
        frame.setVisible(true);
    }
    //关闭窗体的事件
    private static void windowClose(Frame frame){
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}
//事件监听
class MyActionListener implements ActionListener{
    @Override
    public void actionPerformed(ActionEvent e){
        System.out.println("ets");

    }
}

多个事件监听

package com.Icy.day02;

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

        //可以显示的定义触发会返回命令，如果不显示定义，则会走默认的值！
        //可以多个按钮只写一个监听类
        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);
        windowClose(frame);
    }
    //关闭窗体的事件
    private static void windowClose(Frame frame){
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

}
class MyMonitor implements ActionListener{
    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println("按钮点击：msg"+e.getActionCommand());
        e.getActionCommand();
    }
}