偶看新闻古筝高山流水袁莎mp3:说明Is-a，has-a，as-a的语义区别
来源：百度文库 编辑：偶看新闻 时间：2024/05/07 04:25:58
Is-a表示的是“XX是什么”
has-a表示的是“XX具有什么样的属性”
as-a表示的是“XX与YY属于同类”
is-a从字面上看就表示"是一个"的意思，根据继承的特性一个派生类对象可以看成是一个基类对象，也就是说一个派生类对象"是一个"基类对象，所以这种名称符合对这种特性的概括。它没有所谓的全称，这是一种约定俗成的说法。与此对应还有一种类与的类的关系叫has-a，表示"有一个"，这种关系就是组成关系，指的是一个类将另一个类的对象作为自己的数据成员
has-a表示的是“XX具有什么样的属性”
as-a表示的是“XX与YY属于同类”
is-a从字面上看就表示"是一个"的意思，根据继承的特性一个派生类对象可以看成是一个基类对象，也就是说一个派生类对象"是一个"基类对象，所以这种名称符合对这种特性的概括。它没有所谓的全称，这是一种约定俗成的说法。与此对应还有一种类与的类的关系叫has-a，表示"有一个"，这种关系就是组成关系，指的是一个类将另一个类的对象作为自己的数据成员
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