// concurrent/SynchronizedFactory.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.*;

final class SyncFactory implements HasID {

private final int id;

private SyncFactory(SharedArg sa) {

id = sa.get();

}

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

public static synchronized

SyncFactory factory(SharedArg sa) {

return new SyncFactory(sa);

}

}

public class SynchronizedFactory {

public static void main(String[] args) {

Unsafe unsafe = new Unsafe();

IDChecker.test(() ->

SyncFactory.factory(unsafe));

}

}

/* Output:

0

*/