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import java.util.*;
class Apple {
private static long counter;
private final long id = counter++;
public long id() {return id;}
}
public class ApplesAndOrangesWithGenerics {
public static void main(String[] args) {
ArrayList<Apple> apples = new ArrayList<Apple>();
for (int i = 0; i < 3; i++)
apples.add(new Apple());
for (int i = 0; i< apples.size(); i++)
System.out.println(apples.get(i).id());
for (Apple c : apples )
System.out.println(c.id());
}
}