使用了簡單的JFrame窗口，在窗口中添加菜單，菜單選項，點擊鼠標右鍵出現右鍵菜單，用io流將輸入文本域的內容保存。并設置熱鍵alt+x為退出的熱鍵

public class MyNotepad extends JFrame{ //菜單欄 private JMenuBar jmb = new JMenuBar(); //菜單 private JMenu jmFile = new JMenu('文件(F)'); private JMenu jmEdit = new JMenu('編輯(E)'); private JMenu jmFormat = new JMenu('格式(O)'); private JMenu jmFind = new JMenu('查看(V)'); private JMenu jmHelp = new JMenu('幫助(H)');

//菜單項private JMenuItem jmiNew = new JMenuItem('新建');private JMenuItem jmiOpen = new JMenuItem('打開');private JMenuItem jmiSave = new JMenuItem('保存');private JMenuItem jmiOther = new JMenuItem('另存為');private JMenuItem jmiExit = new JMenuItem('退出(X)');private JCheckBoxMenuItem jmiAutoLine = new JCheckBoxMenuItem('自動換行');private JMenuItem jmiFont = new JMenuItem('字體');private JFileChooser jfc = new JFileChooser();private JTextArea jta = new JTextArea();private JScrollPane jsp = new JScrollPane(jta);//上下文菜單private JPopupMenu jpm = new JPopupMenu();private JMenuItem jmiCopy = new JMenuItem('復制');private JMenuItem jmiPaste = new JMenuItem('粘貼');public MyNotepad() { this.setTitle('記事本'); this.setSize(600,400); this.setLocationRelativeTo(null); this.setDefaultCloseOperation(EXIT_ON_CLOSE); this.add(jmb,BorderLayout.NORTH); jmb.add(jmFile); jmb.add(jmEdit); jmb.add(jmFormat); jmb.add(jmFind); jmb.add(jmHelp); jmFile.add(jmiNew); jmFile.add(jmiOpen); jmFile.add(jmiSave); jmFile.add(jmiOther); jmFile.addSeparator(); jmFile.add(jmiExit); jmFormat.add(jmiAutoLine); jmFormat.add(jmiFont); //上下文菜單 jpm.add(jmiCopy); jpm.add(jmiPaste); jpm.add(jmFile); jta.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { if(e.getButton() == 3){ jpm.show(jta, e.getX(), e.getY()); } } }); //文本域自動換行 this.add(jsp,BorderLayout.CENTER); jmiAutoLine.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { boolean selected = jmiAutoLine.isSelected(); if(selected){ jta.setLineWrap(true); }else{ jta.setLineWrap(false); } } });

// 文件新建窗口 jmiNew.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { int choose = jfc.showOpenDialog(MyNotepad.this); switch (choose) { case JFileChooser.APPROVE_OPTION: System.out.println('點擊了打開'); break; case JFileChooser.CANCEL_OPTION: System.out.println('點擊了取消'); break; } } });

//文件保存窗口，用隨機數命名文件名隨時保存進新的文件 jmiSave.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { Random r = new Random(); int a = r.nextInt(100); File file = new File('D:桌面b'+'r'+'a.txt'); try { FileOutputStream fis = new FileOutputStream(file,true); BufferedOutputStream bis = new BufferedOutputStream(fis); byte [] b = jta.getText().getBytes(); try { bis.write(b); bis.flush(); bis.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (FileNotFoundException e) { e.printStackTrace(); } } }); jmiExit.registerKeyboardAction(new ActionListener() { public void actionPerformed(ActionEvent e) { System.exit(0); } }, KeyStroke.getKeyStroke(KeyEvent.VK_X,KeyEvent.ALT_DOWN_MASK), JComponent.WHEN_IN_FOCUSED_WINDOW);//1.設置監聽事件。2.設置熱鍵alt+x關閉窗口3.設置觸發當鼠標聚焦在窗口時 jmiExit.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { System.exit(0); } }); this.setVisible(true); } public static void main(String[] args) { new MyNotepad(); }}

效果如下：

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