监听按钮

监听按钮

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

import javax.swing.* ;

import javax.swing.* ;

class myTest extends JFrame implements ActionListener{
    JButton b1 = null;
    public myTest(){
        this.setSize(400,400) ;
        b1 = new JButton("改变 ");
        Container c = this.getContentPane();
        c.setLayout(new FlowLayout()) ;
        c.add(b1) ;
        //加一个监听
        b1.addActionListener(this);
        
        
        this.setVisible(true) ;
    }
    public void actionPerformed(ActionEvent e){
        if(b1.getForeground() == Color.GREEN){
            b1.setForeground(Color.RED);
        } else {
            b1.setForeground(Color.GREEN) ;
        }
    }
    
    
}


public class GUI {
    public static void main(String[] args) {
        myTest t = new myTest() ;

    }

}

鼠标监听

import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;


class myTest extends JFrame implements MouseListener, ActionListener{
    private JLabel l = null ;
    private JButton b1 = null ;
    private JButton b2 = null ;
    private JButton close = null ;
    public myTest(){
        this.setSize(400,400) ;
        Container c = this.getContentPane() ;
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) ;
        c.setLayout(new FlowLayout()) ;
        l = new JLabel ("卓鹏真帅") ;
        l.addMouseListener(this) ;
        c.add(l) ;
        
        b1= new JButton("点我") ;
        b2 = new JButton("点我") ;
        b1.addActionListener(this) ;
        b2.addActionListener(this) ;
        c.add(b1) ;
        c.add(b2) ;
        
        close = new JButton("关闭") ;
        close.addActionListener(this) ;
        
        c.add(close) ;
        this.setVisible(true) ;
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void mousePressed(MouseEvent e) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        // TODO Auto-generated method stub
        
    }

    @Override//鼠标进去
    public void mouseEntered(MouseEvent e) {
        // TODO Auto-generated method stub
        l.setForeground(Color.RED) ;
    }

    @Override//鼠标离开
    public void mouseExited(MouseEvent e) {
        // TODO Auto-generated method stub
        l.setForeground(Color.BLUE) ;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub
        if(e.getSource() == b1){
            System.out.println("HHH") ;
        } else if(e.getSource() == b2) {
            System.out.println("hhh") ;
        } else if(e.getSource() == close){
            setVisible(false) ;
            System.exit(0) ;// 1,-1.??
        }
    }
    
    
}
public class GUI{
    public static void main(String arg[]){
        myTest t = new myTest () ;
    }
}