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import java.util.Random;
import java.util.concurrent.TimeUnit;

import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.infra.Blackhole;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.RunnerException;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;

/**
 * @implNote :: run with java -jar benchmarks.jar StringPerf -wi 10 -i 10 -f 4
 * @author Edward Beckett <Edward@EdwardBeckett.com>
 * @since 12/24/2015
 */
@State(Scope.Thread)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
public class StringPerf {

    private int[] data;

    @Param({"10000", "20000", "30000", "40000", "50000", "60000", "70000", "80000", "90000", "100000"})
    private int reps;

    @Setup
    public void init() {
        reps = this.reps;
    }

    @Benchmark
    public void assignmentBench(Blackhole bh) {
        assignment(reps);
        bh.consume(reps);
    }

    @Benchmark
    public void builderBench(Blackhole bh) {
        builder(reps);
        bh.consume(reps);
    }

    @Benchmark
    public void concatBench(Blackhole bh) {
        concat(reps);
        bh.consume(reps);
    }


    static void assignment(int rep) {
        int x = 0;
        String s = "String ";
        while (x < rep) {
            s += "String ";
            ++x;
        }
    }

    static void builder(int rep) {
        int x = 0;
        StringBuilder builder = new StringBuilder("String ");
        while (x < rep) {
            builder.append("String ");
            ++x;
        }
    }

    static void concat(int rep) {
        int x = 0;
        String s = "String ";
        while (x < rep) {
            s = s.concat("String ");
            ++x;
        }

    }

    public static void main(String[] args) throws RunnerException {

        Options opt = new OptionsBuilder()
                .include(StringPerf.class.getSimpleName())
                .warmupIterations(10)
                .measurementIterations(10)
                .forks(4)
                .build();

        new Runner(opt).run();
    }
}

Test, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000
StringBuilder, 128709.765, 255235.171, 427853.591, 524721.434, 637707.136, 767883.754, 850727.563, 954963.585, 1037265.986, 1114734.247
Concat, 66624356.104, 278265469.575, 638778227.200, 1146925954.300, 1792719929.400, 2572104397.800, 3522111595.800, 4605412904.500, 5829298725.000, 7182267722.300
Assignment, 70502163.519, 313045828.592, 790608891.200, 1604476535.500, 2613965931.600, 3784940006.700, 5102860455.700, 6707762997.200, 9070591528.600, 11086582529.700