使用了簡單的JFrame視窗，在視窗中新增選單，選單選項，點選滑鼠右鍵出現右鍵選單，用io流將輸入文字域的內容儲存。並設定熱鍵alt+x為退出的熱鍵

public class MyNotepad extends JFrame{
 //選單欄
 private JMenuBar jmb = new JMenuBar();
 //選單
 private JMenu jmFile = new JMenu("檔案(F)");
 private JMenu jmEdit = new JMenu("編輯(E)");
 private JMenu jmFormat = new JMenu("格式(O)");
 private JMenu jmFind = new JMenu("檢視(V)");
 private JMenu jmHelp = new JMenu("幫助(H)");

//選單項
private JMenuItem jmiNew = new JMenuItem("新建");
private JMenuItem jmiOpen = new JMenuItem("開啟");
private JMenuItem jmiSave = new JMenuItem("儲存");
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("字型");

private JFileChooser jfc = new JFileChooser();

private JTextArea jta = new JTextArea();
private JScrollPane jsp = new JScrollPane(jta);

//上下文選單
private JPopupMenu jpm = new JPopupMenu();
private JMenuItem jmiCopy = new JMenuItem("複製");
private JMenuItem jmiPaste = new JMenuItem("貼上");

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);
 
 //上下文選單
 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());
  }
 }
 });
 
 //文字域自動換行
 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);
  }
 }
 });

// 檔案新建視窗
 jmiNew.addActionListener(new ActionListener() {
  public void actionPerformed(ActionEvent e) {
  int choose = jfc.showOpenDialog(MyNotepad.this);
  switch (choose) {
  case JFileChooser.APPROVE_OPTION:
   System.out.println("點選了開啟");
   break;
  case JFileChooser.CANCEL_OPTION:
   System.out.println("點選了取消");
   break;
  }
  }
 });

 //檔案儲存視窗，用隨機數命名檔名隨時儲存進新的檔案
    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.設定監聽事件。2.設定熱鍵alt+x關閉視窗3.設定觸發當滑鼠聚焦在視窗時
 
 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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