GeezerVison is showing github.com — JavaLearningPath/Generics/src/WildCards.java at master · AlexGithubbb/JavaLearningPath

Expand file tree

WildCards.java

Copy path

More file actions

41 lines (35 loc) · 970 Bytes

Copy path

41 lines (35 loc) · 970 Bytes

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

import java.util.Iterator;

import java.util.List;

public class WildCards {

public static void main(String[] args) {

List<String> list1 = null;

List<Object> list2 = null;

// list 1 and list2 are not related, but they both are subclass of List<?>

List<?> list = null;

list = list1;

list = list2;

print(list1);

print(list2);

}

// @Test

// public void test() {

// List<String> list1 = null;

// List<Object> list2 = null;

// // list 1 and list2 are not related, but they both are subclass of List<?>

// List<?> list = null;

// list = list1;

// list = list2;

// print(list1);

// print(list2);

// }

public static void print(List<?> list){

Iterator<?> iterator = list.iterator();

while(iterator.hasNext()){

Object next = iterator.next();

System.out.println(next);

}