当我运行代码时，菜单显示为垂直而不是水平，该如何更改？

Question

Screenshot of the error

import javax.swing.*;

public class Task1 {
    public static void main (String[] args) {

        Task1 a = new Task1();
    }

    public Task1() {
        JFrame frame = new JFrame();
        frame.setVisible(true);
        frame.setSize(400,500);

        JMenuBar menuBar = new JMenuBar();
        JMenu file = new JMenu("File");
        JMenu help = new JMenu("help");

        menuBar.add(help);
        menuBar.add(file);
        frame.add(menuBar);

        JMenuItem load = new JMenuItem("Load");
        JMenuItem save = new JMenuItem("Save");
        JMenuItem exit = new JMenuItem("Exit");
        JMenuItem about = new JMenuItem ("About");

        help.add(about);
        file.add(exit);
        file.add(save);
        file.add(load);


    }
}

This code for some reason when I run it the menus appear vertical not horizontal and I don't know why. I know this is a basic thing but I cant think of a solution that doesn't result in errors.

Answer 1

It's because you're using JFrame.add() instead of JFrame.setMenuBar() . The former adds components (which JMenuBar is) to the inner contentPane of the JFrame . Change your code from this:

frame.add(menuBar);

To this:

frame.setMenuBar(menuBar);