Java继承中的私有方法 [英] private method in inheritance in Java

问题描述

我对在继承中使用私有方法感到困惑，例如:

I have confusion about using private methods in inheritance, for example:

public class A {
    private void say(int number){
        System.out.print("A:"+number);

    }
}

public class B extends A{
    public void say(int number){
        System.out.print("Over:"+number);
    }
}

public class Tester {
    public static void main(String[] args) {

        A a=new B();
        a.say(12);

    }
}

基于上面的代码，我对私有方法的继承感到困惑，私有方法是从class A继承到B吗?或者两个类中的 say 方法完全无关?由于代码在 main() 方法中运行时出错，因此 class B 似乎无法从 class A 调用私有方法.

Based on the codes above, I am confused about the inheritance of private method, is the private method inherited from class A to B? Or the say methods in both classes are totally unrelated? As the code has error when it is running in main() method, it seems like class B cannot invoke the private method from class A.

推荐答案

如果您希望子类可以访问需要保持 private 的超类方法，则 protected 是您要查找的关键字.

If you want a subclass to have access to a superclass method that needs to remain private, then protected is the keyword you're looking for.

• Private 只允许包含该成员的类访问该成员成员.
• Protected 允许在类中访问该成员，并且所有这些都是子类.
• Public 允许任何人访问成员.

• Private allows only the class containing the member to access that member.
• Protected allows the member to be accessed within the class and all of it's subclasses.
• Public allows anyone to access the member.

这篇关于Java继承中的私有方法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！