Benchmarking functional interface in Java 8

Benchmark.java

public interface Benchmark {

    static long invoke(Benchmark f) {
        final long before = System.nanoTime();
        f.run();
        final long after = System.nanoTime();
        return after - before;
    }

    void run();
}

-// EXAMPLE USAGE
-//  final List<Integer> list = Lists.newArrayList(4, 5, 6);
-//  final long timeToExecute = Benchmark.invoke(() -> Collections.shuffle(list));