Cost of Java Finalizers

package bench;

import org.openjdk.jmh.annotations.Benchmark;

import java.lang.ref.PhantomReference;
import java.lang.ref.ReferenceQueue;

public class Finalizer {

    @Benchmark
    public Object plain() {
        return new Plain();
    }

    @Benchmark
    public Object finalizable() {
        return new Finalizable();
    }

    @Benchmark
    public Object phantom() {
        return new Phantom();
    }

    static class Plain {
    }

    static class Finalizable {
        @Override
        protected void finalize() throws Throwable {
            super.finalize();
        }
    }

    static class Phantom {
        static final ReferenceQueue<Phantom> QUEUE = new ReferenceQueue<>();

        public Phantom() {
            new PhantomReference<>(this, QUEUE);
        }
    }
}