java 使用WindowAdapter实现鼠标事件

import java.awt.Container; import java.awt.GridLayout; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; public class EventTest2 extends WindowAdapter implements MouseListener { JFrame f = null; JButton b1 = null; JLabel label = null; public EventTest2() { f = new JFrame("EventTest2"); Container contentPane = f.getContentPane(); contentPane.setLayout(new GridLayout(2, 1)); b1 = new JButton("按钮"); label = new JLabel("起始状态，还没有鼠标事件", JLabel.CENTER); b1.addMouseListener(this); contentPane.add(label); contentPane.add(b1); f.pack(); f.show(); f.addWindowListener(this); } public void mousePressed(MouseEvent e) { label.setText("你已经压下鼠标按钮"); } public void mouseReleased(MouseEvent e) { label.setText("你已经放开鼠标按钮"); } public void mouseEntered(MouseEvent e) { label.setText("鼠标光标进入按钮"); } public void mouseExited(MouseEvent e) { label.setText("鼠标光标离开按钮"); } public void mouseClicked(MouseEvent e) { label.setText("你已经按下按钮"); } public void windowClosing(WindowEvent e) { System.exit(0); } public static void main(String[] args) { new EventTest2(); } }