package ex08_08;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Frame1 extends JFrame {  JPanel contentPane;  BorderLayout borderLayout1 = new BorderLayout();  JLabel jLabel1 = new JLabel();  /**Construct the frame*/  public Frame1() {    enableEvents(AWTEvent.WINDOW_EVENT_MASK);    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  /**Component initialization*/  private void jbInit() throws Exception  {    //setIconImage(Toolkit.getDefaultToolkit().createImage(Frame1.class.getResource("[Your Icon]")));    contentPane = (JPanel) this.getContentPane();    jLabel1.setFont(new java.awt.Font("Dialog", 0, 18));    jLabel1.setText("鼠標按鍵測試");    contentPane.setLayout(borderLayout1);    this.setSize(new Dimension(400, 300));    this.setTitle("Frame Title");    this.addMouseListener(new java.awt.event.MouseAdapter() {      public void mousePressed(MouseEvent e) {        this_mousePressed(e);      }    });    contentPane.add(jLabel1, BorderLayout.NORTH);  }  /**Overridden so we can exit when window is closed*/  protected void processWindowEvent(WindowEvent e) {    super.processWindowEvent(e);    if (e.getID() == WindowEvent.WINDOW_CLOSING) {      System.exit(0);    }  }  void this_mousePressed(MouseEvent e) {if(e.isMetaDown())  jLabel1.setText("這是鼠標右鍵");else  jLabel1.setText("這是鼠標左鍵");  }}