Home » Core Java » util » Collections » Replace all elements of List example

About Ilias Tsagklis

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

Replace all elements of List example

In this example we shall show you how to replace all elements of a List. We will use the fill(List list, Object element) API method of the Collections class. Collections provides static methods that operate on or return collections. The ArrayList is used as a List implementation, but the same API applies to any type of List implementation classes e.g. Vector etc. To replace all elements of a List one should perform the following steps:

  • Create a new ArrayList.
  • Populate the list with elements, with the add(E e) API method of the ArrayList.
  • Invoke the fill(List list, Object element) API method of Collections. It will replace all elements of the provided list with the specified element,

as described in the code snippet below.

package com.javacodegeeks.snippets.core;
 
import java.util.ArrayList;
import java.util.Collections;
 
public class ReplaceAllElementsOfList {
 
  public static void main(String[] args) {

    /*

Please note that the same API applies to any type of 

List implementation classes e.g. Vector etc

*/

    // Create an ArrayList and populate it with elements
    ArrayList arrayList = new ArrayList();
    arrayList.add("element_1");
    arrayList.add("element_2");
    arrayList.add("element_3"); 

    System.out.println("ArrayList elements : " + arrayList);

    // static void fill(List list, Object element) operation replaces all elements of the provided List with the specified element
    Collections.fill(arrayList,"element_4");
 
    System.out.println("ArrayList elements after replacement with element_4 : " + arrayList);
 
  }
}

Output:

ArrayList elements : [element_1, element_2, element_3]
ArrayList elements after replacement with element_4 : [element_4, element_4, element_4]

 
This was an example of how to replace all elements of a List in Java.

Do you want to know how to develop your skillset to become a Java Rockstar?

Subscribe to our newsletter to start Rocking right now!

To get you started we give you our best selling eBooks for FREE!

 

1. JPA Mini Book

2. JVM Troubleshooting Guide

3. JUnit Tutorial for Unit Testing

4. Java Annotations Tutorial

5. Java Interview Questions

6. Spring Interview Questions

7. Android UI Design

 

and many more ....

 

Receive Java & Developer job alerts in your Area

 

Subscribe
Notify of
guest

This site uses Akismet to reduce spam. Learn how your comment data is processed.

0 Comments
Inline Feedbacks
View all comments