用JAVA实现拼图游戏，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。-Using JAVA jigsaw puzzle, use the mouse to drag the selected splicing small picture, you can spell a complete picture. Knowledge point of this example are: listening, Graph