说明：  Java小游戏源代码,制作拼图游戏，执行本实例后，用鼠标拖动选中的小图片进行拼接，可以拼成一幅完整的图片。本实例的知识点有：鼠标事件的监听，Graphics类和Image类的应用。
(Java game source code, create jigsaw puzzle, after the implementation of this example, use the mouse to drag the selected splicing small picture, you can spell a complete picture. Knowledge point of this example are as follows: mouse event monitor, Graphics and Image category type applications.)