Applet编程，详细讲解Applet的生命周期，子体的设置，applet从网页中获取信息，applet和浏览器的通信，更新显示的原理，用Applet来制作动画程序，以及动画程序的优化。-Applet programming, explain in detail the Applet life cycle, set the sub-body, applet access to information, applet and browser communications　a Web page, update the display principle, with the Applet to create animated program, and optimize the animation program.