Arrays.asList().contains() vs Ints.contains

MyBenchmark.java

import java.util.Arrays;
import java.util.concurrent.TimeUnit;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;

import com.google.common.primitives.Ints;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
public class MyBenchmark {

    @Benchmark
    public boolean arraysAsList() {
        return Arrays.asList(3, 4).contains(2);
    }

    @Benchmark
    public boolean intsContains() {
        return Ints.contains(new int[] { 3, 4 }, 2);
    }
}

Results

# JMH 1.7 (released 6 days ago)
# VM invoker: C:\Program Files\Java\jdk1.8.0_40\jre\bin\java.exe
# VM options: <none>
# Warmup: 20 iterations, 1 s each
# Measurement: 5 iterations, 1 s each
# Timeout: 10 min per iteration
# Threads: 1 thread, will synchronize iterations
# Benchmark mode: Average time, time/op
# Benchmark: org.dive.MyBenchmark.arraysAsList

# Run progress: 0,00% complete, ETA 00:00:50
# Fork: 1 of 1
# Warmup Iteration   1: 7,983 ns/op
# Warmup Iteration   2: 6,856 ns/op
# Warmup Iteration   3: 5,557 ns/op
# Warmup Iteration   4: 6,559 ns/op
# Warmup Iteration   5: 5,438 ns/op
# Warmup Iteration   6: 5,345 ns/op
# Warmup Iteration   7: 5,472 ns/op
# Warmup Iteration   8: 5,286 ns/op
# Warmup Iteration   9: 5,298 ns/op
# Warmup Iteration  10: 5,436 ns/op
# Warmup Iteration  11: 5,869 ns/op
# Warmup Iteration  12: 6,757 ns/op
# Warmup Iteration  13: 6,479 ns/op
# Warmup Iteration  14: 5,591 ns/op
# Warmup Iteration  15: 5,606 ns/op
# Warmup Iteration  16: 5,452 ns/op
# Warmup Iteration  17: 5,585 ns/op
# Warmup Iteration  18: 5,494 ns/op
# Warmup Iteration  19: 5,150 ns/op
# Warmup Iteration  20: 5,210 ns/op
Iteration   1: 5,269 ns/op
Iteration   2: 5,296 ns/op
Iteration   3: 5,438 ns/op
Iteration   4: 5,269 ns/op
Iteration   5: 5,402 ns/op


Result: 5,335 ?(99.9%) 0,306 ns/op [Average]
  Statistics: (min, avg, max) = (5,269, 5,335, 5,438), stdev = 0,080
  Confidence interval (99.9%): [5,028, 5,641]


# JMH 1.7 (released 6 days ago)
# VM invoker: C:\Program Files\Java\jdk1.8.0_40\jre\bin\java.exe
# VM options: <none>
# Warmup: 20 iterations, 1 s each
# Measurement: 5 iterations, 1 s each
# Timeout: 10 min per iteration
# Threads: 1 thread, will synchronize iterations
# Benchmark mode: Average time, time/op
# Benchmark: org.dive.MyBenchmark.intsContains

# Run progress: 50,00% complete, ETA 00:00:25
# Fork: 1 of 1
# Warmup Iteration   1: 5,195 ns/op
# Warmup Iteration   2: 4,598 ns/op
# Warmup Iteration   3: 3,666 ns/op
# Warmup Iteration   4: 3,574 ns/op
# Warmup Iteration   5: 3,437 ns/op
# Warmup Iteration   6: 3,281 ns/op
# Warmup Iteration   7: 3,338 ns/op
# Warmup Iteration   8: 3,345 ns/op
# Warmup Iteration   9: 3,345 ns/op
# Warmup Iteration  10: 3,258 ns/op
# Warmup Iteration  11: 3,393 ns/op
# Warmup Iteration  12: 3,452 ns/op
# Warmup Iteration  13: 3,319 ns/op
# Warmup Iteration  14: 3,452 ns/op
# Warmup Iteration  15: 3,249 ns/op
# Warmup Iteration  16: 3,308 ns/op
# Warmup Iteration  17: 3,272 ns/op
# Warmup Iteration  18: 3,443 ns/op
# Warmup Iteration  19: 3,280 ns/op
# Warmup Iteration  20: 3,390 ns/op
Iteration   1: 3,283 ns/op
Iteration   2: 3,261 ns/op
Iteration   3: 3,238 ns/op
Iteration   4: 3,281 ns/op
Iteration   5: 3,386 ns/op


Result: 3,290 ?(99.9%) 0,220 ns/op [Average]
  Statistics: (min, avg, max) = (3,238, 3,290, 3,386), stdev = 0,057
  Confidence interval (99.9%): [3,070, 3,510]


# Run complete. Total time: 00:00:51

Benchmark                 Mode  Cnt  Score   Error  Units
MyBenchmark.arraysAsList  avgt    5  5,335 ? 0,306  ns/op
MyBenchmark.intsContains  avgt    5  3,290 ? 0,220  ns/op