尴尬在创造对象 [英] awkwardness in creating object

问题描述

Temp1 t1 = new Temp2（）;
这里Temp1是Temp2的超类。代码工作完全正常， t1 做为Temp1的参考变量，但是如何 Temp2（）可以作为Temp1的构造函数？

Temp1 t1=new Temp2(); Here Temp1 is superclass of Temp2. The code works perfectly fine and t1 do acts as a reference variable for Temp1 but how can Temp2() works as constructor for Temp1?

推荐答案

这是的基础多态性：想象一下，你有几个继承自父类的子类。您希望通过在父类上定义的接口/方法使用所有这些子类，而不必担心每个子类中的实现细节（每个子类都可能执行不同的操作，但具有相同的整体语义）。

This is the basis for polymorphism: Imagine you have several child classes that inherit from you parent class. You want to use all these child classes through the interface / methods defined on your parent class, without worrying about the implementation details in each child class (each might do something different, but with the same overall semantics).

这是可能的，因为子类有 IS A 与父类继承的父类之间的关系。

This is possible because the child class has a IS A relationship with its parent class since child inherits from parent.

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