Java的模式最有名的：观察员模型，观察股股票的简单模式系统。,可以直接使用。 -The Java model is the most famous: a simple model system of the observer model, the observed shares. Can be used directly.

基于java实现的观察者模式例子 简单的股票模拟-Based on observer mode to achieve java examples- simple stock simulation