掌握Applet程序设计的方法，学会在Applet中绘制图片，能采用双缓冲技术进行图片绘制，会在Applet中采用多线程进行动画显示。能在Applet中实现动画的平滑显示，避免闪烁现象。



在Applet窗口中显示一只鸭子图片，要求这只鸭子以每秒100帧的速率水平移动，移到窗口边界再返回移动。在窗口中点击鼠标，鸭子停止移动；再次点击鼠标，鸭子恢复移动。-Master Applet program design, learn to draw pictures, double buffering technique picture drawn, multithreaded animation display in Applet in Applet. The smooth display of animation in Applet avoid flicker. Applet window displays a duck pictures, duck at a rate of 100 per second level mobile, and moved to the border of the window to move back again. Click the mouse in the window, and ducks stop moving　click the mouse again, recovery moving ducks.