如何让我的基本SWT应用程序在Mac OS X 10.5.6中正常退出？

import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.events.ShellEvent;
import org.eclipse.swt.events.ShellListener;

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

        // Add your controls to the shell here

        shell.addShellListener(new ShellListener() {
            public void shellActivated(ShellEvent e) {
            }

            public void shellClosed(ShellEvent e) {
                System.exit(0);
            }

            public void shellDeactivated(ShellEvent e) {
            }

            public void shellDeiconified(ShellEvent e) {
            }

            public void shellIconified(ShellEvent e) {
            }
        });

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

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

        display.dispose();
    }
}