// concurrent/GuardedIDField.java

// (c)2021 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();

@Override public int getID() { return id; }

public static void main(String[] args) {

IDChecker.test(GuardedIDField::new);

}

}

/* Output:

0

*/