Replace an element at specified index of Java ArrayList

package org.best.example;
   
        /*
      Replace an element at specified index of Java ArrayList Example
      This Java Example shows how to replace an element at specified index of java
      ArrayList object using set method.
    */
    
    import java.util.ArrayList;
    
    public class ReplaceElementAtSpecifiedIndexArrayListExample {
    
    public static void main(String[] args) {
    //create an ArrayList object
    ArrayList arrayList = new ArrayList();
    
    //Add elements to Arraylist
    arrayList.add("1");
    arrayList.add("2");
    arrayList.add("3");
    
    /*
      To replace an element at the specified index of ArrayList use
      Object set(int index, Object obj) method.
      This method replaces the specified element at the specified index in the
      ArrayList and returns the element previously at the specified position.
      */
    arrayList.set(1,"REPLACED ELEMENT");
    
    System.out.println("ArrayList contains...");
    //display elements of ArrayList
    for(int index=0; index < arrayList.size(); index++)
    System.out.println(arrayList.get(index));
    
    }
    }
    
    /*
    Output would be
    ArrayList contains...
    1
    REPLACED ELEMENT
    3
    */