Analysis of LinkedList principle code in Java

The main research in this article is about the LinkedList principle in Java, which is introduced as follows.

In summary, LinkedList in Java actually uses two-way linked lists, and the basic operation of LinkedList is the operation of two-way linked lists.

It can be clearly seen above that each element in the linked list corresponds to a node, and the node contains three parts, one is the reference of the previous node, one is the content of the element, and one is the reference of the next node.

The process of adding elements to a linked list is to add a node at the end of the linked list

 void linkLast(E e) { final Node<E> l = last; final Node<E> newNode = new Node<>(l, e, null); last = newNode; if (l == null) first = newNode; else l.next = newNode; size++; modCount++; }

first step:

 final Node<E> l = last;

Step 2:

 final Node<E> newNode = new Node<>(l, e, null);

Step 3:

 last = newNode;

Step 4:

 l.next = newNode;

Other operations such as obtaining linked list elements are basically the same, and they are all basic operations of two-way linked lists.

Summarize

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