Class GuardedIDField

concurrent/GuardedIDField.java:7–15

import java.util.concurrent.atomic.*;

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