将嵌套类继承到子类中 | 将嵌套类继承到子类中

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问题描述

当我浏览文章时， 超类中的私人成员，我看到这一行

When I was going through this article, under the section Private Members in a Superclass, i saw this line

我的问题是我们如何在<$ c $中直接访问嵌套类 Base c>派生（就像我们可以访问任何 public ， protected 字段）？

My question is how can we DIRECTLY access the Nested class of Base in Derived (like we can access any public, protected fields)?

和

如果有办法，怎么能派生访问 p 这是私有字段> 到嵌套 ？

if there is a way, how can Derived access p which is private field of Base through Nested?

public class Base {

    protected int f;
    private int p;

    public class Nested {

        public int getP() {
            return p;
        }
    }
}

class Derived extends Base {

    public void newMethod() {
        System.out.println(f); // i understand inheriting protected field

        // how to access the inherited Nested class here? and if accessed how to retrieve 'p' ?
    }

}

提前感谢您的时间和努力在这个线程中！

Thanks in advance for your time and effort in this thread!

推荐答案

Base.Nested theClassBro= new Base.Nested();

或者对于Derived类，这应该有效：

Or for the Derived class, this should work:

Derived.Nested theClassBro= new Derived.Nested();

我不确定你是否需要使用超级关键字

I'm not sure if you need to use the super keyword or not

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