用Applet写的菜单程序 machine

用Applet写的菜单程序 machine(1) : 前几天在Java.sun.com上看见一个用Applet写的菜单程序。由于Applet目前不支持Menu(
据我所知）,: 也许这个程序对你有些帮助。
原来的程序好像不完整，无法编译，我特地到java.sun.com上又载了一个，
source如下：
/*
Copyright: Sun Microsystems 1997. All rights reserved.
Author: Patrick Chan (www.xeo.com) 7/19/96
Version: 1.1
*/

import java.applet.*;
import java.awt.*;
import java.util.*;
import java.net.*;

public class XeoMenu extends Applet {
// The background image. This had better not be null.
Image image;

// These two fields are used to do double-buffering.
// The dimensions of bbuf is exactly the dimensions of the applet.
Image bbuf;
GraphiCS bbufG;

// This field is set to true only when the background image has
// completely loaded.
boolean imageDone;

/* Menu data */
Rectangle[] hitArea;
Rectangle[] srcRect;
Point[] dstPt;
boolean[] down;
String[] url;

/* Submenu data */
String[][] itemUrl;
String[][] item;

// If >= 0, this fields holds the index of the current menu.
// If -1, no menu is current.
int curMenu;

// If >= 0, this fields holds the index of the current menu item.
// If -1, no menu item is current.
int curMenuItem;

// This is an array of rectangles - one rectangle for each menu item.
// Each rectangle specifies the
// location (relative to the left-corner of the applet) of a menu item.
//
// menuItemRect is null when curMenu is -1.
// It becomes non-null when curMenu >= 0.
//
// Note: it would have been better programming to define classes for
// the menu and menu items. However, I decided for this little applet
// to keep the number of class files to a minimum to minimize the download
// time.
Rectangle[] menuItemRect;