Can't understand Java doubly linked list [closed]

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Closed 3 years ago.

I have this code

public class Doublylinkedlist {
    private DLLNode head;
    private DLLNode tail;
    private int length;
}

What is this DLLNode head declaration? What data type it is? Can someone please explain?

Here is the DLLNode class

Public class DLLNode{
private int data ;
private DLLNode prev;
private DLLNode next;

}

Now what is this 'private DLLNode prev'? What data type it is ?

回答1:

DLLNode is a user defined class just like your Doublylinkedlist class.

A possible example of what that DLLNode class might look like:

public class DLLNode
{
    int data;
    DLLNode next;
    DLLNode prev;

    public DLLNode(int data)
    {
        this.data = data;
        this.next = null;
        this.prev = null;
    }
}

来源：https://stackoverflow.com/questions/35533868/cant-understand-java-doubly-linked-list