内部类的泛型

Question

I have an outer class ( LinkedStack<T> ) that has an inner node class. Is it necessary to declare the inner Node class with the same generic like

private Node<T>

as opposed to

private Node

or does it not make any difference?

Answer 1

If the inner class is a static class then yes, otherwise no.

Ie:

class LinkedStack<T> {
    // references to T refer to LinkedStack's T.

    static class Node<T> {
        // references to T refer to Node's T.
        T data;
    }

    // ...
    Node<T> node;
}

or:

class LinkedStack<T> {
    // references to T refer to LinkedStack's T.

    class Node {
        // references to T refer to LinkedStack's T.
        T data;
    }

    // ...
    Node node;
}