事件处理程序

Posted 2022-03-17 angst18

package 事件处理;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class Xiu implements ActionListener 
    JFrame f;
    JPanel p;
    JButton b;
    public Xiu() 
        f=new JFrame();
        p=new JPanel();
        b=new JButton("单击");
        b.addActionListener(this);
        f.setSize(400,450);
        f.add(p);
        p.add(b);
        f.setVisible(true);
    

    public static void main(String[] args) 
        new Xiu();

    

    @Override
    public void actionPerformed(ActionEvent arg0) 
        p.setBackground(Color.BLUE);