单选

以下叙述中,说法正确的是(45)。

  • A.若对象A可以给对象B发送消息,那么对象A、B相互可见
  • B.对象间不能共享类定义的变量,但可通过类名访问静态变量(类变量)
  • C.封装反映了类间的一种层次关系,而组合反映了一种整体与部分的关系
  • D.单身模式能够保证一个类仅有一个实例
参考答案
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