What is a linked list in java

Linked list is a data structure arranged according to the logical relationship of element nodes. This article will tell you about the linked list in Java. Friends who are interested can learn about it.

Linked list is a data structure arranged according to the logical relationship of element nodes. Linked lists can be used to store multiple data, which is similar to the concept of arrays.

But the array itself has a shortcoming - the length of the array is fixed and cannot be changed. When the length is fixed, the first choice is definitely the array, but in actual development, the length of the content to be saved is often uncertain. , then you can use a structure like a linked list instead of an array.

The linked list is the simplest data structure. Its main purpose is to save multiple data by relying on reference relationships. So assuming that the data to be saved now is a string (reference type), you can Save according to the relationship shown in the figure.

Java linked list code:

//每一个链表实际上就是由多个节点组成的
public class Node { // 定义一个节点
	private String data; // 用于保存数据
	private Node next; // 用于保存下一个节点
	// 每一个Node类对象都必须保存有响应的数据
 
	public Node(String data) {
		this.data = data;
	}
 
	public void setNext(Node next) {
		this.next = next;
	}
 
	public Node getNext() {
		return this.next;
	}
 
	public String getData() {
		return this.data;
	}
 
	// 实现节点的添加
	// 第一次调用（Link）：this代表Link.root
	// 第二次调用（Node）：this代表Link.root.next
	// 第三次调用（Node）：this代表Link.root.next.next
	public void addNode(Node newNode) {
		if (this.next == null) { // 如果只有一个节点
			this.next = newNode; // 保存新节点
		} else { // 当前节点后面还有节点
			// 当前节点的下一个节点继续保存
			this.next.addNode(newNode);
 
		}
	}

// 第一次调用（Link）：this代表Link.root
	// 第二次调用（Node）：this代表Link.root.next
	// 第三次调用（Node）：this代表Link.root.next.next
	public void printNode() {
		System.out.println(this.data);// 输出当前数据
		if (this.next != null) {// 如果还有下一个节点
			this.next.printNode();// 输出下一节点
		}
	}
}
public class LinkDemo {
 
	public static void main(String[] args) {
	 Link link = new Link() ;
	 link.add("hello");   //存放数据
	 link.add("world");
	 link.add("wwww");
	 link.print();     //展示数据
		
	}
	
}
//负责数据的设置和输出
public class Link {
	private Node root; //根节点
//增加数据
  public void add (String data){
	  //为了设置数据的先后关系，所以将data包装在一个Node类对象
	  Node newNode = new Node(data);
	  if(this.root == null ){  //一个链表只有一个根节点
		  this.root = newNode;  //将新的节点设置为根节点
	  }else{  
		  //从root节点后找到合适的位置
		  this.root.addNode(newNode);
	  }
  }
//输出数据
public void print(){
	if( this.root != null ){
		this.root.printNode();
	}
}
}

Related learning recommendations: java basic tutorial

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