// concurrent/GuardedIDField.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.concurrent.atomic.*;

public class GuardedIDField implements HasID {
 private static AtomicInteger counter =
 new AtomicInteger();
 private int id = counter.getAndIncrement();
 public int getID() { return id; }
 public static void main(String[] args) {
 IDChecker.test(GuardedIDField::new);
 }
}
/* Output:
0
*/