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About Byron Kiourtzoglou

Byron Kiourtzoglou
Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.

Replace ArrayList elements using index example

This is an example of how to replace elements in an ArrayList using index. Replacing elements in an ArrayList using index implies that you should:

  • Create a new ArrayList.
  • Populate the arrayList with elements, using add(E e) API method of ArrayList.
  • Use set(int index, Object obj) method of ArrayList, using a specified element and a specified index. The method replaces an element at the specified index of the arrayList with the given element. It returns the element previously at the specified position.

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

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

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

Use Object set(int index, Object obj) operation to replace an element at 

the specified index of ArrayList. It returns the element previously at 

the specified position.
    */
    arrayList.set(1,"element_4");
 
    System.out.println("Elements in ArrayList :");
    for(int i=0; i < arrayList.size(); i++)

System.out.println(arrayList.get(i));
 
  }
}

Output:

Elements in ArrayList :
element_1
element_4
element_3

 
This was an example of how to replace elements in an ArrayList using index in Java.

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