Representation of Singly Linked List in Java ?

In this post, I will talk about the Representation of Singly Linked List in Java?

Singly LinkedList is a Data Structure used to store the collection of nodes and having the following properties:

It has a sequence of nodes.
Every Node has two parts, the first part is data, and the second part is the reference to the next node in the List.
First Node is called head Node.
Last node always point to NULL

Singly LinkedList

package com.kkjavatutorials.util;

/**
 * Singly LinkedList generic class
 * @author KK JavaTutorials
 */
public class LinkedList<T> {

	//This class Represent Node in Singly LinkedList
	private static class Node<T>{
		
		private T data;
		private Node<T> next;
	
		public Node(T data) {
			super();
			this.data = data;
			this.next = null;
		}
	}
	
	public static void main(String[] args) {
		//Let's say I would like to create below Singly LinkedList Representation
		//10->20->30->40->50->null
		
		Node<Integer> head = new Node<Integer>(10);
		Node<Integer> secondNode = new Node<Integer>(20);
		Node<Integer> thirdNode = new Node<Integer>(30);
		Node<Integer> fourthNode = new Node<Integer>(40);
		Node<Integer> fifthNode = new Node<Integer>(50);
		
		head.next = secondNode;
		secondNode.next = thirdNode;
		thirdNode.next = fourthNode;
		fourthNode.next = fifthNode;
		
		Node<Integer> currentNode = head;
		
		while (currentNode != null) {
			System.out.print(currentNode.data+" ");
			currentNode = currentNode.next;
			System.out.println(currentNode);
		}
	}
}

package com.kkjavatutorials.util;

/**

* Singly LinkedList generic class

* @author KK JavaTutorials

public class LinkedList<T> {

//This class Represent Node in Singly LinkedList

private static class Node<T>{

private T data;

private Node<T> next;

public Node(T data) {

super();

this.data = data;

this.next = null;

}

public static void main(String[] args) {

//Let's say I would like to create below Singly LinkedList Representation

//10->20->30->40->50->null

Node<Integer> head = new Node<Integer>(10);

Node<Integer> secondNode = new Node<Integer>(20);

Node<Integer> thirdNode = new Node<Integer>(30);

Node<Integer> fourthNode = new Node<Integer>(40);

Node<Integer> fifthNode = new Node<Integer>(50);

head.next = secondNode;

secondNode.next = thirdNode;

thirdNode.next = fourthNode;

fourthNode.next = fifthNode;

Node<Integer> currentNode = head;

while (currentNode != null) {

System.out.print(currentNode.data+" ");

currentNode = currentNode.next;

System.out.println(currentNode);

}

Output of this Program:

10 [email protected]
20 [email protected]
30 [email protected]
40 [email protected]
50 null

This output shows that the last node is pointing to a null reference

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