IS-A和HAS-A关系在OOPS中同时出现 [英] IS-A and HAS-A relationship occur together in OOPS

问题描述

在Java中，每个类都是Object的子级.因此，是一个IS-A类对象.现在，如果它包含对象类型的数据成员(在这种情况下实际上是任何类型)，那么它将是HAS-A关系. 与上述陈述有关，我有以下疑问. 1.这种关系是否有名字，IS-A和HAS-A在一起? 2.是否有现实世界的例子? 3.从OOPS的角度来看，可以建立这种关系还是应该避免这种关系?

In Java every class is a child of Object. So a class IS-A Object. Now if it contains a data member of Object type (actually any type in this case), then it would be HAS-A relationship. Related to above statement I have following doubts. 1. Is there a name for this relationship, IS-A and HAS-A coming together? 2. Are there any real world example for it? 3. From OOPS perspective, is it okay to have this relationship or should be avoided?

推荐答案

1. 这种关系是否有名字，IS-A和HAS-A在一起?

否.

1. 有没有现实世界的例子?

List<Set> aListThatContainsSets

列表和集合都是集合.在此示例中，列表具有一堆集合.

List and Set are both Collections. In this example a List has a bunch of Sets.

1. 从OOPS的角度来看，可以保持这种关系还是应该避免这种关系?

是的，很好.您甚至可以自己拥有HAS-A.

Yes its fine. You can even HAS-A yourself.

public class MyClass{

     MyClass me;

}

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