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About Ilias Tsagklis

Ilias Tsagklis
Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.

Insert element at specific index in LinkedList example

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.

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