import java.util.*;
public class ListClient {
   public static void main(String[] args) {
      // Implementing our own IntList interface
      IntList list1 = new ArrayIntList();
      System.out.println("list1");
      processList(list1);
      
      System.out.println();
      
      IntList list2 = new LinkedIntList();
      System.out.println("list2");
      processList(list2);
      
      
      // Example using Java's built in Collections
      // ArrayIntList  -> ArrayList<E>
      // LinkedIntList -> LinkedList<E>
      // IntList       -> List<E>
      
      List<String> list1 = new ArrayList<String>();
      List<String> list2 = new LinkedList<String>();
      
      // Wrapper classes 
      // int     -> Integer
      // double  -> Double
      // boolean -> Boolean
      List<Integer> list3 = new ArrayList<>();  // diamond operatror
   
   }
   
   public static void processList(IntList list) {
      list.add(18);
      list.add(27);
      list.add(93);
      System.out.println(list);
      list.remove(1);
      System.out.println(list);
   }
}