import java.awt.*;
import java.awt.event.*;

public class SimpleMenu {
    private Frame f  = new Frame("test");
    private MenuBar mb = new MenuBar();
    Menu file  =  new Menu("file");
    Menu edit  =  new Menu("edit");

    PopupMenu pop = new PopupMenu();

    MenuItem crateItem = new MenuItem("create");
    MenuItem saveItem = new MenuItem("save");

    MenuItem exitItem = new MenuItem("exit",new MenuShortcut(KeyEvent.VK_X));

    CheckBoxMenuItem autoWrap = new CheckBoxMenuItem("autoWrap");

    MenuItem copyItem = new MenuItem("copy");
    MenuItem pasteItem = new MenuItem("paste");

    Menu format =  new Menu("format");
    /*ctrl + shift + / */
    MenuItem commentItem = new MenuItem("comment",new MenuShortcut(KeyEvent.VK_SLASH,true));

    MenuItem cancelItem = new MenuItem("cancelComment");
    private TextArea ta = new TextArea(6,40);

    public void init(){
        ActionListener menuListener = e -> {
          var cmd = e.getActionCommand();
          ta.append(" click " + cmd + " menu " + " \n ");
          if(cmd.equals("exit")){
              System.exit(0);
          }
        };

        commentItem.addActionListener(menuListener);
        exitItem.addActionListener(menuListener);

        pop.add(autoWrap);
        pop.addSeparator();
        pop.add(copyItem);
        pop.add(pasteItem);

        pop.add(new MenuItem("-"));
        pop.add(format);

        final Panel p = new Panel();
        p.setPreferredSize(new Dimension(300,160));
        p.add(pop);
        p.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseReleased(MouseEvent e) {
                if (e.isPopupTrigger()){
                    pop.show(p,e.getX(),e.getY());
                }
            }
        });

//        file.add(crateItem);
//        file.add(saveItem);
//        file.add(exitItem);
//
//        edit.add(autoWrap);
//        edit.addSeparator();
//        edit.add(copyItem);
//        edit.add(pasteItem);

        format.add(commentItem);
        format.add(cancelItem);

//        edit.add(new MenuItem("-"));
//        edit.add(format);


//
//        mb.add(file);
//        mb.add(edit);

        f.add(p);


        f.setMenuBar(mb);
        f.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        f.add(ta,BorderLayout.norTH);
        f.pack();
        f.setVisible(true);

    }

    public static void main(String[] args) {
        new SimpleMenu().init();
    }


}

output:

class Rightclickmenu extends JTextArea implements MouseListener {
    private static final long serialVersionUID = -2308615404205560110L;
    private JPopupMenu pop = null; // 弹出菜单
    private JMenuItem copy = null, paste = null, cut = null; // 三个功能菜单
    public Rightclickmenu() {
        super();
        init();
    }
    private void init() {
        this.addMouseListener(this);
        pop = new JPopupMenu();
        pop.add(copy = new JMenuItem("复制"));
        pop.add(paste = new JMenuItem("粘贴"));
        pop.add(cut = new JMenuItem("剪切"));
        copy.setAccelerator(KeyStroke.getKeyStroke(''C'', InputEvent.CTRL_MASK));
        paste.setAccelerator(KeyStroke.getKeyStroke(''V'', InputEvent.CTRL_MASK));
        cut.setAccelerator(KeyStroke.getKeyStroke(''X'', InputEvent.CTRL_MASK));
        copy.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                action(e);
            }
        });
        paste.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                action(e);
            }
        });
        cut.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                action(e);
            }
        });
        this.add(pop);
    }

    public void action(ActionEvent e) {
        String str = e.getActionCommand();
        if (str.equals(copy.getText())) { // 复制
            this.copy();
        } else if (str.equals(paste.getText())) { // 粘贴
            this.paste();
        } else if (str.equals(cut.getText())) { // 剪切
            this.cut();
        }
    }
    public JPopupMenu getPop() {
        return pop;
    }
    public void setPop(JPopupMenu pop) {
        this.pop = pop;
    }

    public boolean isClipboardString() {
        boolean b = false;
        Clipboard clipboard = this.getToolkit().getSystemClipboard();
        Transferable content = clipboard.getContents(this);
        try {
            if (content.getTransferData(DataFlavor.stringFlavor) instanceof String) {
                b = true;
            }
        } catch (Exception e) {
        }
        return b;
    }

    public boolean isCanCopy() {
        boolean b = false;
        int start = this.getSelectionStart();
        int end = this.getSelectionEnd();
        if (start != end)
            b = true;
        return b;
    }
    public void mouseClicked(MouseEvent e) {
    }
    public void mouseEntered(MouseEvent e) {
    }
    public void mouseExited(MouseEvent e) {
    }
    public void mousePressed(MouseEvent e) {
        if (e.getButton() == MouseEvent.BUTTON3) {
            copy.setEnabled(isCanCopy());
            paste.setEnabled(isClipboardString());
            cut.setEnabled(isCanCopy());
            pop.show(this, e.getX(), e.getY());
        }
    }
    public void mouseReleased(MouseEvent e) {
    }
}

 1 package TomAwt;
 2 
 3 
 4 import java.applet.Applet;
 5 import java.awt.*;
 6 public class TomAwt_04 extends Applet{
 7     public void init(){
 8     //set layout to grid layout with 3 rows and 3 columns
 9         setLayout(new GridLayout(3,3));
10     //add eight buttons to applet
11         for(int i=1;i<=8;i++){
12             add(new Button("Button" + i));
13         }
14     }
15 }