设计模式中的( )模式将对象组合成树形结构以表示"部分一整体"的层次结构,使得客户对单个对象和组合对象的使用具有一致性。下图为该模式的类图,其中,(请作答此空)定义有子部件的那些部件的行为;组合部件的对象由( )通过component提供的接口操作。
- A.Client
- B.Component
- C.Leaf
- D.Composite
正确答案及解析
正确答案
解析
本题主要组合设计模式。组合设计模式将对象组合成树形结构以表示"部分一整体"的层次结构,使得客户对单个对象和组合对象的使用具有一致性。
在类图中,Component为合成的对象声明接口;某些情况下,实现从此接口派生出所有类共有的默认行为,定义一个接口可以访问及管理它的多个部分(GetChild),如果必要也可以在递归结构中定义一个接口访问它的父节点,并且实现它;Leaf在合成中表示叶节点对象,叶节点没有子节点;Composite用来定义有子节点(子部件)的部件的行为,存储子节点(子部件);Client通过Component接口控制组合部分的对象。
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