Java SWT:如何指示菜单项被选中

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.Shell;

public class Main {
    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Java SWT Menu Example");

        // 创建菜单
        Menu menu = new Menu(shell, SWT.BAR);
        shell.setMenuBar(menu);

        // 创建菜单项
        MenuItem menuItem = new MenuItem(menu, SWT.CHECK);
        menuItem.setText("选项1");

        // 设置菜单项选中状态
        menuItem.setSelection(true);

        shell.pack();
        shell.open();

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        display.dispose();
    }
}