time complexity of removing the last element from arraylist code example

Example 1: remove last element from arraylist java

ArrayList<Integer> list = new ArrayList<>();
list.add(1);
list.add(2);
list.add(3);

list.remove(list.size()-1); //removes 3

Example 2: How to remove last element from arraylist in java

// How to remove last element from arraylist in java
import java.util.ArrayList;
import java.util.List;
public class ArrayListRemoveLastElement
{
   public static void main(String[] args)
   {
      List<Integer> al = new ArrayList<>();
      al.add(56);
      al.add(28);
      al.add(39);
      al.add(59);
      al.add(82);
      // using size() method to find index of last element
      int index = al.size() - 1;
      // deleting last element by passing index
      al.remove(index);
      System.out.println("After remove last element from arraylist: " + al);
   }
}