Linked List – clone method

In this post, we will be discussing the clone method in the linked list class and how it will be used to create a copy of the linked list object. The clone method in the linked list overrides the clone method of the Object class.

Method declaration – public Object clone().
What does it do? It will make a shallow copy of the linked list object for which the function is called.
What will it do? – It will return an object of Object class which we will need to be cast to the required type ( in this case, LinkedList type).

Let’s see the things in action with some code.

import java.util.LinkedList;

public class Codekru {

	public static void main(String[] args) {
		LinkedList<String> linkedList = new LinkedList<String>();
		linkedList.add("hi");
		linkedList.add("codekru");

		System.out.println("Original Linked List: " + linkedList);

		LinkedList<String> secondlinkedList = (LinkedList<String>) linkedList.clone();

		System.out.println("Cloned Linked List: " + secondlinkedList);

	}
}

Output –

Original Linked List: [hi, codekru]
Cloned Linked List: [hi, codekru]

So, what is going behind the clone method?
Well, first we make an empty clone, make its first and the last node null, and size zero, and then we run a for loop over the object that has to be cloned and will keep on adding the nodes to the newly made cloned linked list ( We are using add method of the linked list to add elements).

Time complexity –

Here we are majorly doing to operations in the clone method –

  • Running a for loop on to the object which have to be cloned ( So, this will take O(n) time )
  • Using add method in each iteration to add elements in the newly made cloned linked list ( and this will take O(1) time, as add method has a time complexity of O(1) ).

So, overall, time complexity will be O(1) in clone method

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