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 ~

A collection of functions for programatically manipulating the structure and connectivity of Simulink models. In Simulink, models can be altered using a collection of built-in function calls (e.g. add_block, add_line) and by modifying block parameter