import java.lang.management.*;

/** JEP 439 (final): Generational ZGC is opt-in on 21 with -XX:+ZGenerational. Prints the GC beans each mode registers. */
public class GcNamesDemo {
    public static void main(String[] args) {
        for (GarbageCollectorMXBean b : ManagementFactory.getGarbageCollectorMXBeans()) System.out.println("gc bean         : " + b.getName());
    }
}