说明： 在Java中实现动画有很多种办法,但它们实现的基本原理是一样的,即在
屏幕上画出一系列的帧来造成运动的感觉。
我们先构造一个程序的框架,再慢慢扩展,使之功能比较齐备。 (in Java to achieve animation there are many ways, but they realize the basic principle is the same as that on the screen he painted a series of frames to create the feeling of movement. First we constructed a framework of the procedure, then gradually expanded to make it function more readily available.)
