java se 的练习小程序。名为chat，基本可以实现一个client 启动里一个client 会感知到头像会亮，当信息来实 头像闪动，聊天窗口保存有聊天历史。-java se exercises applet. Called chat, a client start a basic client perceived avatar will light when the information to the real head flashing chat window to save chat