简单的聊天小程序。提供了基本的聊天的功能，通过此例能学习java中如何利用Socket建立服务器程序和客户端程序以及关于多进程间调度等方面的知识--Simple chat applet. Provides basic chat functionality through java in this case to learn how to use the Socket server and client to establish procedures and inter-process sched