Replace Element of an ArrayList in Java

You can replace an element of an ArrayList using the set() method of the Collections class. This method accepts two parameters an integer parameter indicating the index of the element to be replaced and an element to replace with.

Example

 Live Demo

import java.util.ArrayList;

public class ArrayListSample {
   public static void main(String[] args) {
      ArrayList<String> list = new ArrayList<String>();
      list.add("JavaFx");
      list.add("Java");
      list.add("WebGL");
      list.add("OpenCV");
      System.out.println(list);
      list.set(2, "HBase");
      System.out.println(list);
   }
}

Output

[JavaFx, Java, WebGL, OpenCV]
[JavaFx, Java, HBase, OpenCV]