LINKEDList implementation principles and application scenarios in Jin Collections
LINKEDList implementation principles and application scenarios in Jin Collections
Overview:
LinkedList is a common data structure that forms a linked list through the pointer between nodes. It implements the List interface and can be used to store different types of objects.In Jin Collections, LinkedList is implemented in a specific way. This article will introduce the implementation principle of LinkedList and the application scenarios in Java.
LinkedList implementation principle:
The implementation principle of LinkedList is based on the concept of a two -way linked list.In LinkedList, each node contains a reference to a node and the next node.This structure allows nodes to store non -continuous storage in memory, because each node has its own front drive and successor node information.Such a design makes the operation and delete elements very efficient, because it only needs to change the references of some nodes without re -assign memory like an array.However, this also means that LinkedList is less efficient when accessing elements in a specific position because it needs to traverse the entire linked list.
During the implementation of LinkedList's Java implementation, each node is represented by the Node class.The Node class contains the value of the element and the reference to the forward and the latter node.LinkedList itself has a reference to the first node and the last node, as well as a variable that records the length.
Application scenario of linkedList:
LinkedList applies to the application scenario in Java programming under the following cases:
1. You need to frequently perform insertion and delete operations:
Since LinkedList only needs to change a small amount of node reference, it is very efficient when inserting and deleting elements.Therefore, when these operations need to be performed frequently, it is more appropriate to use LinkedList.For example, when implementing a message queue or task queue, it is often necessary to add and delete elements. LinkedList provides an efficient solution.
2. No need to access the element quickly:
Since LinkedList needs to traverse nodes to access elements in a specific position, it is less efficient when directly accessing elements in specific positions.Therefore, LinkedList is a good choice when the elements that do not need to access a specific location.For example, when achieving a data structure of an advanced first -out (FIFO), such as a queue, LinkedList can provide better performance.
Example code:
The following is an example code that uses linkedList to implement the queue data structure:
import java.util.LinkedList;
public class QueueExample {
private LinkedList<String> queue = new LinkedList<>();
public void enqueue(String element) {
queue.addLast(element);
}
public String dequeue() {
return queue.pollFirst();
}
public void printQueue() {
for (String element : queue) {
System.out.println(element);
}
}
public static void main(String[] args) {
QueueExample queueExample = new QueueExample();
queueExample.enqueue("A");
queueExample.enqueue("B");
queueExample.enqueue("C");
queueExample.printQueue();
System.out.println(queueExample.dequeue());
queueExample.printQueue();
}
}
The above code creates a linkedList queue data structure.The Enqueue method is used to add the element to the end of the queue. The Dequeue method is used to remove and return an element from the head of the queue.The PrintQueue method is used to print all elements in the current queue.
in conclusion:
LinkedList is an important implementation in Jin Collection. It is based on the data structure of a two -way linked list. It is suitable for scenes that need to frequently perform insertion and delete operations, and do not need to quickly access elements.By understanding the implementation principles and application scenarios of LinkedList, we can better use this data structure for Java programming.
