继承不能调用子类方法 [英] Inheritance can't call child class method

问题描述

嘿，我正在尝试调用子类方法(ChildClass扩展了SuperClass())

Hey i'm trying to call child class method(ChildClass extends SuperClass())

SuperClass s=new ChildClass();
s.childClassMethod();

它没有看到ChildClass方法，我只能调用的方法是SuperClass() 我知道这可能是一个愚蠢的问题，但无论如何都会欢呼

It doesn't see the ChildClass method the only methods i can call are from SuperClass() i know it's propably a stupid question but anyway cheers

推荐答案

是的，您看不到它，因为s是类型SuperClass的类型，没有此方法-这显然会破坏多态原则.

That's right, you can't see it because s is type SuperClass which doesn't have this method - this would obviously break Polymorphism principle.

因此，您要么必须更改((ChildClass) s).childClassMethod();之类的代码，要么将s设置为ChildClass类型.

So you either have to change the code like ((ChildClass) s).childClassMethod(); or make s as ChildClass type.

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