package com.event;
import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

//Java事件處理
public class EventDemo extends JFrame implements ActionListener {

	// 定義一個panel
	Panel mp = null;
	JButton jb1 = null;
	JButton jb2 = null;

	public static void main(String[] args) {
		EventDemo ed = new EventDemo();

	}

	public EventDemo() {
		mp = new Panel();
		jb1 = new JButton("黑色");
		jb2 = new JButton("紅色");

		this.add(jb1, BorderLayout.NORTH);
		mp.setBackground(Color.black);
		this.add(mp);
		this.add(jb2, BorderLayout.SOUTH);

		Cat myCat=new Cat();
		
		jb1.addActionListener(myCat);
		jb2.addActionListener(myCat);
		
		// 註冊監聽
		jb1.addActionListener(this);
		//指定action命令
		jb1.setActionCommand("aa");
		jb2.addActionListener(this);
		jb2.setActionCommand("bb");
		
		this.setSize(200, 150);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setVisible(true);
	}

	// 對事件處理的方法
	@Override
	public void actionPerformed(ActionEvent e) {
		//判斷是哪個按鈕被點選
		if(e.getActionCommand().equals("aa")){
			//System.out.println("黑色");	
			mp.setBackground(Color.BLACK);
		}else if(e.getActionCommand().equals("bb")){
			//System.out.println("紅色");
			mp.setBackground(Color.RED);
		}
	}

}

//一個普通的類也可以監聽
class Cat implements ActionListener{

	@Override
	public void actionPerformed(ActionEvent e) {
		if(e.getActionCommand().equals("aa")){
			System.out.println("貓也知道你按下了黑色按鈕");
		}else if(e.getActionCommand().equals("bb")){
			System.out.println("貓也知道你按下了紅色按鈕");
		}
	}
	
}