如何确定使用IS A还是HAS关系

问题描述

public class B {

    public String getMe()
    {
        return "Some";
    }
}

假设我有一个上面的类，我们应该通过哪个参数决定使用什么?是还是有关系?

Assume that i have a above class , by which parameters should we decide what to use ?? Whether is a or Has a Relation ??

HAS-A

public class A {



    public static void main(String args[])
    {
        B b = new B();
        System.out.println(b.getMe());
    }
}

或

public class A  extends B
{


    public static void main(String args[])
    {
        A b = new A();
        System.out.println(b.getMe());
    }
}

推荐答案

取决于逻辑关系.只是有道理.

Depends on the logical relation. It just needs to make sense.

示例:

假设您有动物类.
因此，您有以下类别:动物，狗，猫，豹，毛皮，脚

Lets say you have Animal classes.
So you have these classes: Animal, Dog, Cat , Leopard, Fur, Feet

猫和狗 IS A 动物.
豹 IS A 目录
动物 HAS A 毛皮，脚.

Cat and Dog IS A Animal.
Leopard IS A Cat.
Animal HAS A Fur, Feet.

简而言之:

IS A 关系表示您继承并扩展了基类的功能.
具有A 关系意味着该班级正在使用另一个班级，因此它已成为该班级的成员.

IS A relationship means you inherit and extend the functionality of the base class.
HAS A relationship means the class is using another class, so it has it as a member.

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