// lowlevel/SynchronizedEvenProducer.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.

// Simplifying mutexes with the synchronized keyword

import onjava.Nap;

public class

SynchronizedEvenProducer extends IntGenerator {

private int currentEvenValue = 0;

@Override public synchronized int next() {

++currentEvenValue;

new Nap(0.01); // Cause failure faster

++currentEvenValue;

return currentEvenValue;

}

public static void main(String[] args) {

EvenChecker.test(new SynchronizedEvenProducer());

}

}

/* Output:

No odd numbers discovered

*/