Access and change item in Java ArrayList

By using the get() method we can access an element in the ArrayList, which is assigned to the index number:

import java.util.ArrayList;

public class Main { 
  public static void main(String[] args) { 
    ArrayList<String> mobiles = new ArrayList<String>();
    mobiles.add("Samsung");
    mobiles.add("Apple");
    mobiles.add("Nokia");
    mobiles.add("Sony");
    System.out.println(mobiles.get(0));
  } 
}

Change an Item in Java ArrayList

To reorganize an element, use the set() method and refer to the index number:

import java.util.ArrayList;

public class Main { 
  public static void main(String[] args) { 
    ArrayList<String> mobiles = new ArrayList<String>();
    mobiles.add("Samsung");
    mobiles.add("Apple");
    mobiles.add("Nokia");
    mobiles.add("Sony");
    mobiles.set(0, "LG");
    System.out.println(mobiles);
  } 
}