C-S模式下提供主机间相互通信的功能，基于socket-CS mode to provide communications between the host functions, based on the socket

在设计模式里面有一个叫观察者模式，在j2me里面经常会有使用到这个模式，比如在连接网络的时候，更新界面~-In the design of models, there' s a known observer mode, which often have to use j2me to this model, such as connecting to the internet, update interface ~