SumBenchmark.java

import org.openjdk.jmh.annotations.*;

import java.util.concurrent.TimeUnit;
import java.util.stream.IntStream;
import java.util.stream.LongStream;
import java.util.stream.Stream;

@Warmup(iterations = 5)
@Measurement(iterations = 10)
@Fork(1)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
public class SumBenchmark {

    @Benchmark
    public long primitiveSumTest() {
        long sum = 0L;
        for (long i = 0L; i < 1000L; i++) {
            sum += i;
        }
        return sum;
    }


    @Benchmark
    public long wrapperSumTest() {
        Long sum = 0L;
        for (Long i = 0L; i < 1000L; i++) {
            sum += i;
        }
        return sum;
    }

    @Benchmark
    public long wrapper2SumTest() {
        Long sum = new Long(0L);
        for (Long i = new Long(0L); i < 1000L; i = Long.sum(i, 1L)) {
            sum = Long.sum(sum, i);
        }
        return sum;
    }

    @Benchmark
    public int intStreamSumTest() {
        return IntStream.iterate(0, i -> i + 1).limit(1000).sum();
    }

    @Benchmark
    public int intStreamRangeSumTest() {
        return IntStream.rangeClosed(0, 1000).sum();
    }

    @Benchmark
    public long longStreamTest() throws Exception {
        return LongStream.iterate(0, i -> i + 1).limit(1000).sum();
    }

    @Benchmark
    public long longStreamRangeTest() throws Exception {
        return LongStream.rangeClosed(0, 1000).sum();
    }

    @Benchmark
    public long streamTest() throws Exception {
        return Stream.iterate(0, i -> i + 1).limit(1000).reduce(Integer::sum).get();
    }
}

pom.xml dependency

    <dependency>
      <groupId>org.openjdk.jmh</groupId>
      <artifactId>jmh-core</artifactId>
      <version>1.11.3</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.openjdk.jmh</groupId>
      <artifactId>jmh-generator-annprocess</artifactId>
      <version>1.11.3</version>
      <scope>test</scope>
    </dependency>