自学第六次博客（动作事件的处理）

import javax.swing.*;

public class Action extends JFrame{
    static JButton b1=new JButton("红色");
    static JButton b2=new JButton("黄色");
    static JButton b3=new JButton("蓝色");
    static JPanel p=new JPanel();
    static JLabel l=new JLabel("请单击下面按钮");

    public Action(){
        super("动作事件");
        setBounds(10,20,220,200);
        l.setOpaque(true);
        l.setBounds(0, 0, 220, 150);
        l.setHorizontalAlignment(JLabel.CENTER);
        add(l,"Center");//将标签置于中间
        p.add(b1);//添加按钮
        p.add(b2);
        p.add(b3);
        add(p,"South");
        b1.addActionListener(new B());
        b2.addActionListener(new B());
        b3.addActionListener(new B());
        setVisible(true);
        
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Action f=new Action();
    

    }

}

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

public class B implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {
        
        // TODO Auto-generated method stub
        if(e.getSource()==Action.b1){
            Action.l.setText("按下的是红色按钮");
            Action.l.setBackground(Color.red);
        } 
        if(e.getSource()==Action.b2){
            Action.l.setText("按下的是黄色按钮");
            Action.l.setBackground(Color.yellow);
        }
        if(e.getSource()==Action.b3){
            Action.l.setText("按下的是蓝色按钮");
            Action.l.setBackground(Color.blue);
        }

    }

}