package generics;

import java.util.*;

import java.lang.reflect.*;

/**

* RUN:

* javac generics/GenericWriting.java && java generics.GenericWriting

* OUTPUT:

* [generics.Apple@1befab0]

* [generics.Apple@13c5982]

* [generics.Apple@1befab0, generics.Apple@1186fab]

* [generics.Apple@13c5982, generics.Apple@14b7453]

*/

public class GenericWriting {

static <T> void writeExact(List<T> list, T item) {

list.add(item);

}

static List<Apple> apples = new ArrayList<Apple>();

static List<Fruit> fruits = new ArrayList<Fruit>();

static void f1() {

writeExact(apples, new Apple());

writeExact(fruits, new Apple());

}

static <T> void writeWithWildcard(List<? super T> list, T item) {

list.add(item);

}

static void f2() {

writeWithWildcard(apples, new Apple());

writeWithWildcard(fruits, new Apple());

}

public static void main(String[] args) {

f1();

System.out.println(apples);

System.out.println(fruits);

f2();

System.out.println(apples);

System.out.println(fruits);

}

}