29 lines
761 B
Java
29 lines
761 B
Java
// collections/GenericsAndUpcasting.java
|
|
// (c)2016 MindView LLC: see Copyright.txt
|
|
// We make no guarantees that this code is fit for any purpose.
|
|
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
|
|
import java.util.*;
|
|
|
|
class GrannySmith extends Apple {}
|
|
class Gala extends Apple {}
|
|
class Fuji extends Apple {}
|
|
class Braeburn extends Apple {}
|
|
|
|
public class GenericsAndUpcasting {
|
|
public static void main(String[] args) {
|
|
ArrayList<Apple> apples = new ArrayList<>();
|
|
apples.add(new GrannySmith());
|
|
apples.add(new Gala());
|
|
apples.add(new Fuji());
|
|
apples.add(new Braeburn());
|
|
for(Apple apple : apples)
|
|
System.out.println(apple);
|
|
}
|
|
}
|
|
/* Output:
|
|
GrannySmith@1db9742
|
|
Gala@106d69c
|
|
Fuji@52e922
|
|
Braeburn@25154f
|
|
*/
|