The below example will help you to remove an Arraylist item using the element index. To remove an item from an arrayList I have used Object remove (int index) method. This method returns a reference to the item that was removed. You can see below program it will clearly describe you how to remove item from ArrayList. 

public class RemoveItem{
    public static void main(String[]args){
        ArrayList arrayList = new ArrayList();
        arrayList.add("item_1");
         arrayList.add("item_2");
          arrayList.add("item_3");
           arrayList.add("item_4");
      
      //remove an element from the specified index of ArrayList use Object remove(int index)method.

      Object obj =arrayList.remove(3);
      System.out.print(obj+"is removed frok ArrayList");
      System.out.println("Items in ArrayList :");
      for(int i=0;i<arrayList.size();i++)
        System.out.println(arrayList.get(i));

    }
}