Insert element at specific index in LinkedList example

Ilias TsagklisNovember 11th, 2012Last Updated: May 22nd, 2013

0 1,031 1 minute read

With this example we are going to demonstrate how to insert an element at a specific index in a LinkedList. In short, to insert an element at a specific index in a LinkedList you should:

Create a LinkedList.
Populate the list with elements, with add(E e) API method.
Invoke add(int index , Object element) API method of LinkedList. It inserts the specified element at the specified index in the list, while current and subsequent elements are shifted to the right.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;
 
import java.util.LinkedList;
 
public class InsertElementAtIndexLinkedList {
 
  public static void main(String[] args) {
 
    // Create a LinkedList and populate it with elements
    LinkedList linkedList = new LinkedList();
    linkedList.add("element_1");
    linkedList.add("element_2");
    linkedList.add("element_3");
    linkedList.add("element_4");
    linkedList.add("element_5");
 
    System.out.println("LinkedList contains : " + linkedList);
 
    /*
     * void add(int index , Object element) method inserts the specified element 
     * at the specified index in the LinkedList. Current and subsequent elements
     * are shifted to the right
     */
     linkedList.add(3, "element_6");
     System.out.println("After inserting element_6 at index 3, LinkedList contains : " + linkedList);
  }
}

Output:

LinkedList contains : [element_1, element_2, element_3, element_4, element_5]
After inserting element_6 at index 3, LinkedList contains : [element_1, element_2, element_3, element_6, element_4, element_5]

This was an example of how to insert an element at a specific index in a LinkedList in Java.