帮我写一个java左侧菜单

好的，我可以为您提供一个 Java 左侧菜单的代码示例：

import javax.swing.*;
import java.awt.*;

public class LeftMenu extends JFrame {
private JPanel panel;
private JButton button1, button2, button3;

public LeftMenu() {
setTitle("左侧菜单");
setSize(300, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

panel = new JPanel();
panel.setLayout(new GridLayout(3, 1));

button1 = new JButton("菜单项1");
button2 = new JButton("菜单项2");
button3 = new JButton("菜单项3");

panel.add(button1);
panel.add(button2);
panel.add(button3);

add(panel, BorderLayout.WEST);
setVisible(true);
}

public static void main(String[] args) {
new LeftMenu();
}
}

希望这个代码示例能够帮到您！