package Test2016;import java.util.ArrayList;import java.util.List;public class Test2016 {	public static void main(String[] args) {				List
      first = new ArrayList
     
      ();	//Fruit -> Apple				first.add(new Apple());		first.add(new Fruit());		first.add(new RedApple());		//		first.add(new Food());	//error				System.out.println(first.get(0));		System.out.println(first.get(1));				List
       second = new ArrayList
      
       ();				second.add(null);	}	}class Food {}class Fruit extends Food {}class Apple extends Fruit {}class RedApple extends Apple {}