是否有用于添加或删除SWT Combo项的侦听器？

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class ComboExample {
    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);

        Combo combo = new Combo(shell, SWT.DROP_DOWN);
        combo.setItems(new String[] { "Item 1", "Item 2", "Item 3" });

        combo.addSelectionListener(new SelectionListener() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                // 当Combo项被选中时执行的操作
                System.out.println("Selected item: " + combo.getText());
            }

            @Override
            public void widgetDefaultSelected(SelectionEvent e) {
                // 当Combo项被双击时执行的操作
                System.out.println("Default selected item: " + combo.getText());
            }
        });

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

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

        display.dispose();
    }
}