OnJava8-Examples/containers/ApplesAndOrangesWithGenerics.java

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// containers/ApplesAndOrangesWithGenerics.java
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// <20>2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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import java.util.*;
public class ApplesAndOrangesWithGenerics {
public static void main(String[] args) {
ArrayList<Apple> apples = new ArrayList<>();
for(int i = 0; i < 3; i++)
apples.add(new Apple());
// Compile-time error:
// apples.add(new Orange());
for(Apple apple : apples) {
System.out.println(apple.id());
}
// Using for-in:
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for(Apple c : apples)
System.out.println(c.id());
}
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}
/* Output:
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0
1
2
0
1
2
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*/