Implementing a Linked List in Java: A Step-by-Step Guide

Introduction

A linked list is a data structure that allows for easy insertion and deletion of data. In a linked list, each data element is linked to the next data element by a pointer. This makes linked lists very efficient for inserting and deleting data.

In Java, a linked list can be implemented using the ArrayList class. The ArrayList class provides a number of methods that can be used to insert and delete data from a linked list.

Linked List Implementation

The first node in the list is the head node. The head node contains the address of the first node in the list. The second node in the list is the next node. The next node contains the address of the next node in the list. The last node in the list is the tail node. The tail node contains the address of the last node in the list.

public class LinkedList {

    Node head;

    //Inner class Node
    class Node {
	Node next;
	int data;

	public Node(int data) {
	    this.data = data;
	    next = null;
	}
    }

    /**
     * @Method Insert
     * @param linkedList
     * @param value
     * @return
     */
    public LinkedList insert(LinkedList linkedList, int value) {

	// Create new node
	Node newNode = new Node(value);
	newNode.next = null;

	if (linkedList.head == null) {
	    linkedList.head = newNode;
	} else {
	    Node last = linkedList.head;
	    while (last.next != null) {
		last = last.next;
	    }
	    last.next = newNode;
	}

	return linkedList;
    }

    /**
     * @Method printLinkedList
     * @param linkedList
     */
    public static void printLinkedList(LinkedList linkedList) {
	Node currentNode = linkedList.head;
	while (currentNode != null) {
	    System.out.println(currentNode.data + " ");

	    // Next node
	    currentNode = currentNode.next;
	}
    }

    /**
     * @Method main
     * @param args
     */
    public static void main(String[] args) {
	LinkedList linkedList = new LinkedList();
	linkedList = linkedList.insert(linkedList, 10);
	linkedList = linkedList.insert(linkedList, 20);
	linkedList = linkedList.insert(linkedList, 30);
	linkedList = linkedList.insert(linkedList, 40);
	linkedList = linkedList.insert(linkedList, 60);

	//Print linked list value
	printLinkedList(linkedList);
    }

}

Insert: 

This is a public method that inserts a node into a linked list. If the node does not have a next node, then a new node is created and linked to the old node. The function then returns the linkedList.

PrintLinkedList:

This method prints the data in a linked list, starting with the first node.

Conclusion

A linked list is a data structure that allows for the easy addition and removal of items from any position in the list. Java provides a number of classes that make it easy to create and work with linked lists. In this conclusion, we will discuss some of the benefits of using a linked list in Java. 

One of the benefits of using a linked list in Java is that it is easy to add and remove items from any position in the list. This makes the linked list a good choice for implementing queues and stacks. Additionally, the linked list is a good choice for storing large amounts of data, as it can be easily expanded as needed.

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