Java GUI之JMenuBar

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public class JMenuDemo extends JFrame {   /**    *     */   JMenuBar bar;   JMenu file;   JMenu help;   private static final long serialVersionUID = 1L;   JMenuDemo() {      setTitle("记事本");      setPosition();      setBounds(300, 200, 500, 300);      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);      setVisible(true);   }   public void setPosition() {      bar = new JMenuBar(); // 菜单栏      // 一级菜单      file = new JMenu("文件");      JMenu edit = new JMenu("编辑");      help = new JMenu("帮助");      JMenu form = new JMenu("格式");      // file之下的二级菜单      JMenuItem newCreate = new JMenuItem("新建");      JMenuItem open = new JMenuItem("打开");      JMenuItem save = new JMenuItem("保存");      JMenuItem saveAs = new JMenuItem("另存为");      JMenuItem exit = new JMenuItem("退出");      file.add(newCreate);      file.add(open);      file.add(save);      file.add(saveAs);      file.addSeparator();      file.add(exit);      // form之下的二级菜单      JCheckBoxMenuItem binary = new JCheckBoxMenuItem("二进制");      JMenuItem font = new JMenuItem("字体");      form.add(binary);      form.add(font);      // help之下的二级菜单      JMenuItem aboutNotepad = new JMenuItem("about notepad");      help.add(aboutNotepad);      // 监听事件，响应各个菜单的功能      newCreate.addActionListener(new ActionListener() {         @Override         public void actionPerformed(ActionEvent arg0) {            // TODO Auto-generated method stub            // JFrame f=new JFrame();            // f.setVisible(true);            new JMenuDemo();            JOptionPane.showMessageDialog(null, "新建一个窗口");         }      });      exit.addActionListener(new ActionListener() {         @Override         public void actionPerformed(ActionEvent arg0) {            // TODO Auto-generated method stub            System.exit(0);         }      });      aboutNotepad.addActionListener(new ActionListener() {         @Override         public void actionPerformed(ActionEvent arg0) {            // TODO Auto-generated method stub            JOptionPane.showMessageDialog(null, "这是一个记事本");         }      });      // 将一级菜单添加到菜单栏      bar.add(file);      bar.add(edit);      bar.add(form);      bar.add(help);      // setJMenuBar(bar); 设置菜单项 将菜单添加到JFrame窗口顶端，从左上端开始      add(bar, "North");      JTextArea area = new JTextArea("", 20, 20);      add(area, "Center");   }   public static void main(String[] args) {      new JMenuDemo();   }}
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