Java – Replace an element in a LinkedList with example

In this article, we will learn how to replace an element in linked list using set() method. This method is especially useful when we need to replace element at specified index in linked list.

The set() method:

public E set(int index, E newElement): This method takes two arguments, index and newElement. It replaces the current element at the specified index with the newElement.

Java Program to replace an element in a LinkedList

In this program, we have a linked list of string type, we have added few string elements to it. Later, we replaced the 3rd element (present at index 2) with the new value using set() method.

import java.util.LinkedList;
public class ReplaceInLinkedList {
 
 public static void main(String[] args) {
 
    // Create a LinkedList
    LinkedList<String> linkedlist = new LinkedList<String>();
 
    // Add elements to LinkedList
    linkedlist.add("Cobol");
    linkedlist.add("JCL");
    linkedlist.add("C++");
    linkedlist.add("C#");
    linkedlist.add("Java");
 
    // Displaying Elements before replace
    System.out.println("Before Replace:");
    for(String str: linkedlist){
       System.out.println(str);
    }
 
    // Replacing 3rd Element with new value
    linkedlist.set(2, "NEW VALUE");
    System.out.println("\n3rd Element Replaced \n");

    // Displaying Elements after replace
    System.out.println("After Replace:");
    for(String str2: linkedlist){
       System.out.println(str2);
    }
 }
}

Output:

Before Replace:
Cobol
JCL
C++
C#
Java

3rd Element Replaced 

After Replace:
Cobol
JCL
NEW VALUE
C#
Java

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