如何将JMenuItem的键盘快捷键设置为CTRL +S+A？

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;

public class MenuItemExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Menu Example");
        JMenuBar menuBar = new JMenuBar();
        JMenu fileMenu = new JMenu("File");
        JMenuItem saveItem = new JMenuItem("Save");

        // 设置快捷键为CTRL + S + A
        KeyStroke keyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_S, KeyEvent.CTRL_DOWN_MASK | KeyEvent.SHIFT_DOWN_MASK);
        saveItem.setAccelerator(keyStroke);

        saveItem.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // 处理保存操作
                System.out.println("Save action performed");
            }
        });

        fileMenu.add(saveItem);
        menuBar.add(fileMenu);
        frame.setJMenuBar(menuBar);
        frame.setSize(300, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}