DoubleStreamAverageBenchmark.java

public class DoubleStreamAverageBenchmark {

    @State(Scope.Thread)
    public static class BenchmarkState {
        public double[] values;

        public BenchmarkState() {
            values  = new double[1000000];
            for (int i = 0; i < 1000000; i ++)
                values[i] = Math.random();
        }

    }

    @Benchmark
    @BenchmarkMode(Mode.All)
    public void benchmark(BenchmarkState state, Blackhole bh) {
        final OptionalDouble average = Arrays.stream(state.values).average();
        final double asDouble = average.getAsDouble();
        bh.consume(asDouble);
    }

}