superClass的私有成员是否由子类继承... Java？ [英] Are the private members of superClass inherited by a subClass... Java?

问题描述

我已经完成了这个：

子类是否继承私有字段？

但我仍然感到困惑......

But I'm still confused...

我说的只是继承而不是访问。我知道他们在副课程中不可见。

I'm talking about inheriting only and not accessing. I know that they aren't visible out side class.

但子类'对象是否拥有超级类中私有成员的自己副本？

But does the subclass' object has it's own copies of those private members in super class?

例如......

class Base {
    private int i;
}

class Derived extends Base {
    int j;
}

现在，

Base b = new Base();
Derived d = new Derived();

int的大小是4

现在，

b的大小是4，d的大小是8

Will the size of b be 4 and size of d be 8

或

d的大小也只有4？

当我说b时，我正在谈论堆上的对象和d而不是参考。

Of course I'm talking about the objects on the heap when I say b and d and not the references.

更新：我刚刚阅读了Kathy Sierra的SCJP书& Bert ......它说它们不是继承的....我发布了这个更新，因为仍然有很多人说是......

UPDATE: I just read in SCJP Book of Kathy Sierra & Bert... It says that they are NOT inherited.... I posted this update since still there are bunch of people saying yes...

推荐答案

是的，子类的实例将包含父类的私有字段的副本。

Yes, instances of the subclass will have copies of a private field of the parent class.

但它们对子类不可见，所以访问它们的唯一方法是通过父类的方法。

They will however not be visible to the subclass, so the only way to access them is via methods of the parent class.

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