Interpretation of Java documentation: Functional analysis of the addLast() method of the LinkedList class

Interpretation of Java documentation: Analysis of the addLast() method function of the LinkedList class

In the Java collection framework, the LinkedList class is a List interface implemented by a doubly linked list. The LinkedList class provides many methods for operating linked lists, including the addLast() method. This article will provide a detailed analysis of the addLast() method of LinkedList and provide specific code examples.

The function of the addLast() method is to append the specified element to the end of this list. Specifically, it creates a new node and adds it to the linked list as the last node. If the linked list is empty, the node is set as the head node. If the linked list is not empty, set the node to the next node after the last node and update the reference of the tail node.

The following is the source code of the addLast() method:

public void addLast(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++;
}

Code sample analysis:

1. First, the method receives a generic parameter e, indicating that it is to be added to The element at the end of the linked list.
2. Create a new node newNode, its previous node is the current tail node last, the data is e, and the next node is null.
3. Point the tail node of the linked list to the new node newNode.
4. If the linked list is empty, set the new node newNode as the head node first of the linked list.
5. If the linked list is not empty, point the next node of the current tail node to the new node newNode.
6. Update the size of the linked list and the modification count modCount.

The following is a sample code using the addLast() method:

import java.util.LinkedList;

public class AddLastExample {
    public static void main(String[] args) {
        LinkedList<Integer> linkedList = new LinkedList<>();
        linkedList.addLast(1);
        linkedList.addLast(2);
        linkedList.addLast(3);
        System.out.println(linkedList); // 输出：[1, 2, 3]
    }
}

In the sample code, we create a LinkedList object linkedList and continuously call the addLast() method to add Three elements 1, 2 and 3. Finally, we output the contents of the linked list and the result is [1, 2, 3]. This shows that the addLast() method indeed appends the element to the end of the linked list.

Summary:
The addLast() method is a method provided by the LinkedList class to add elements to the end of the linked list. It does this by creating a new node and adding it as the last node to the linked list. When using the addLast() method, you need to pay attention to the empty and non-empty conditions of the linked list, as well as the corresponding update of the size and modification count. In practical applications, linked lists can be flexibly used to solve problems based on the characteristics of the addLast() method.

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