（ ）设计模式允许一个对象在其状态改变时，通知依赖它的所有对象。该设计模式的类图如下图，其中，（ ）在其状态发生改变时，向它的各个观察者发出通知。
问题1选项
A.命令( Command)
B.责任链(Chain of Responsibility)
C.观察者( Observer)
D.迭代器(Iterator)
问题2选项
A.Subject
B.ConcreteSubject
C.Observer
D.ConcreteObserver
正确答案及解析
正确答案
解析
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