如何在没有setBounds的情况下将JMenuBar与JLayeredPane一起使用

Question

有一个简单的代码：JMenuBar和JLayeredPane中带有JBatton的JPanel。问题是JLayeredPane与JMenuBar重叠。如何修复？

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLayeredPane;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPanel;
public class Simple extends JFrame{
    public Simple() {
        super("Simple");
        setSize(1000, 500);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
        JMenuBar menu =  new JMenuBar();
        JMenu File =  new JMenu("File");
        menu.add(File);
        setJMenuBar(menu);
        JPanel panel =  new JPanel();
        panel.setSize(1000, 500);
        JButton button = new JButton("Button");
        panel.add(button);
        getLayeredPane().add(panel,JLayeredPane.DEFAULT_LAYER);
    }
    public static void main(String[] args) {
        new Simple();
    }
}

Answer 1

我对解析进行了定义。

Container conn = getContentPane();
content.setLayout(new BorderLayout());  
JLayeredPane desk =  new JDesktopPane();
desk.setOpaque(false);
conn.add(desktop, BorderLayout.CENTER);
setJMenuBar(new MainMenu());