（ ）模式定义一系列的算法，把它们一个个封装起来，并且使它们可以相互替换，使得算法可以独立于使用它们的客户而变化。以下（ ）情况适合选用该模式。
①一个客户需要使用一组相关对象
②一个对象的改变需要改变其他对象
③需要使用一个算法的不同变体
④许多相关的类仅仅是行为有异
问题1选项
A.命令（Command）
B.责任链（Chain of Responsibility）
C.观察者（Observer）
D.策略（Strategy）
问题2选项
A.①②
B.②③
C.③④
D.①④
正确答案及解析
正确答案
解析
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