使用子类对象访问超类函数 [英] Accessing super class function using subclass object

问题描述

我有一个子类的对象扩展其超类。子类中有一个重写方法，可以使用该对象调用。
是否可以使用子类对象调用超类的函数？

I have an object of a subclass extending its superclass. There is an overridden method in subclass which can be called using the object. Is that possible to call the superclass's function using the subclass object?

package supercall;

public class Main {

    public static void main(String[] args) {
        SomeClass obj = new SubClass();
        obj.go();   //is there anything like, obj.super.go()?
    }

}

class SomeClass {
    SomeClass() {

    }
    public void go() {
        System.out.println("Someclass go");
    }
}

class SubClass extends SomeClass {
    SubClass() {

    }
    @Override
    public void go() {
        System.out.println("Subclass go");
    }
}

考虑上面的代码。

此处打印

子类go

Subclass go

。相反，我必须打印

Superclass go

Superclass go

。

推荐答案

不，这是不可能的，如果你认为你需要它，重新考虑你的设计。覆盖方法的重点是替换其功能。如果一个不同的类对该类的内部工作了解得太多，那么你就完全杀了封装。

No, it's not possible, and if you think you need it, rethink your design. The whole point of overriding a method is to replace its functionality. If a different class knows that much about that class's internal workings, you're completely killing encapsulation.

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