package ex11_03;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Frame1 extends JFrame {  JPanel contentPane;  JMenuBar jMenuBar1 = new JMenuBar();  JMenu jMenu1 = new JMenu();  JMenuItem jMenuItem1 = new JMenuItem();  JMenu jMenu2 = new JMenu();  JMenu jMenu3 = new JMenu();  JMenu jMenu4 = new JMenu();  JMenuItem jMenuItem2 = new JMenuItem();  JMenuItem jMenuItem3 = new JMenuItem();  JMenuItem jMenuItem4 = new JMenuItem();  JMenuItem jMenuItem5 = new JMenuItem();  JCheckBoxMenuItem jCheckBoxMenuItem1 = new JCheckBoxMenuItem();  JCheckBoxMenuItem jCheckBoxMenuItem2 = new JCheckBoxMenuItem();  JLabel jLabel1 = new JLabel();  JMenuItem jMenuItem6 = new JMenuItem();  /**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();    contentPane.setLayout(null);    this.setJMenuBar(jMenuBar1);    this.setSize(new Dimension(400, 300));    this.setTitle("Frame Title");    jMenu1.setText("文件");    jMenuItem1.setText("關閉");    jMenuItem1.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        jMenuItem1_actionPerformed(e);      }    });    jMenu2.setText("字體");    jMenu3.setText("樣式");    jMenu4.setEnabled(false);    jMenu4.setText("顏色");    jMenuItem3.setText("藍色");    jMenuItem3.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        jMenuItem3_actionPerformed(e);      }    });    jMenuItem4.setText("紅色");    jMenuItem4.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        jMenuItem4_actionPerformed(e);      }    });    jMenuItem5.setText("綠色");    jMenuItem5.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        jMenuItem5_actionPerformed(e);      }    });    jCheckBoxMenuItem1.setText("粗體");    jCheckBoxMenuItem1.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        jCheckBoxMenuItem1_actionPerformed(e);      }    });    jCheckBoxMenuItem2.setText("斜體");    jCheckBoxMenuItem2.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        jCheckBoxMenuItem2_actionPerformed(e);      }    });    jLabel1.setFont(new java.awt.Font("Dialog", 0, 18));    jLabel1.setText("菜單使用范例");    jLabel1.setBounds(new Rectangle(42, 128, 143, 47));    jMenuItem6.setText("加底線");    jMenuBar1.add(jMenu1);    jMenuBar1.add(jMenu2);    jMenu1.add(jMenuItem1);    jMenu2.add(jMenu3);    jMenu2.add(jMenu4);    jMenu3.add(jCheckBoxMenuItem1);    jMenu3.add(jCheckBoxMenuItem2);    jMenu3.add(jMenuItem6);    jMenu4.add(jMenuItem3);    jMenu4.add(jMenuItem4);    jMenu4.add(jMenuItem5);    contentPane.add(jLabel1, null);  }  /**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);    }  }/*************************************************///黑色文字  void jMenuItem2_actionPerformed(ActionEvent e) {jLabel1.setForeground(Color.black);jMenuItem2.setEnabled(false);jMenuItem3.setEnabled(true);jMenuItem4.setEnabled(true);jMenuItem5.setEnabled(true);  }/*************************************************///藍色  void jMenuItem3_actionPerformed(ActionEvent e) {jLabel1.setForeground(Color.blue);jMenuItem2.setEnabled(true);jMenuItem3.setEnabled(false);jMenuItem4.setEnabled(true);jMenuItem5.setEnabled(true);  }/*************************************************///紅色  void jMenuItem4_actionPerformed(ActionEvent e) {jLabel1.setForeground(Color.red);jMenuItem2.setEnabled(true);jMenuItem3.setEnabled(true);jMenuItem4.setEnabled(false);jMenuItem5.setEnabled(true);  }/*************************************************///綠色  void jMenuItem5_actionPerformed(ActionEvent e) {jLabel1.setForeground(Color.green);jMenuItem2.setEnabled(true);jMenuItem3.setEnabled(true);jMenuItem4.setEnabled(true);jMenuItem5.setEnabled(false);  }/*************************************************///粗體命令項目  void jCheckBoxMenuItem1_actionPerformed(ActionEvent e) {  int x=0,y=0;  //確認粗體項目是否選取  if (jCheckBoxMenuItem1.isSelected()==true)    {      x=1;      //改變選取狀態      jCheckBoxMenuItem1.setSelected(true);    }    else    {      x=0;      //改變選取狀態      jCheckBoxMenuItem1.setSelected(false);    }//確定斜體項目是否選取if (jCheckBoxMenuItem2.isSelected()==true)  {y=2;}//重新設置文本樣式jLabel1.setFont(new Font("Dialog",x+y,18));  }/*************************************************///斜體命令項目  void jCheckBoxMenuItem2_actionPerformed(ActionEvent e) {  int x=0,y=0;  //確認斜項目是否選取  if (jCheckBoxMenuItem2.isSelected()==true)  {    x=2;    //改變選取狀態    jCheckBoxMenuItem2.setSelected(true);  }  else    {    x=0;      //改變選取狀態    jCheckBoxMenuItem2.setSelected(false);    }//確定粗體項目是否選取if (jCheckBoxMenuItem1.isSelected()==true)  {y=1;}//重新設置文字樣式jLabel1.setFont(new Font("Dialog",x+y,18));  }/*************************************************///關閉程序  void jMenuItem1_actionPerformed(ActionEvent e) {System.exit(0);  }}