Test 1 Results

Benchmark                     (arg)  Mode  Samples  Score   Error  Units
o.s.MyBenchmark.baseline          1  avgt       50  5.346 ñ 0.033  ns/op
o.s.MyBenchmark.baseline        100  avgt       50  5.402 ñ 0.053  ns/op
o.s.MyBenchmark.baseline         10  avgt       50  5.409 ñ 0.067  ns/op
o.s.MyBenchmark.baseline       1000  avgt       50  5.409 ñ 0.057  ns/op
o.s.MyBenchmark.baseline          5  avgt       50  5.373 ñ 0.057  ns/op
o.s.MyBenchmark.mapTest           1  avgt       50  6.989 ñ 0.044  ns/op
o.s.MyBenchmark.mapTest         100  avgt       50  7.259 ñ 0.111  ns/op
o.s.MyBenchmark.mapTest          10  avgt       50  7.125 ñ 0.159  ns/op
o.s.MyBenchmark.mapTest        1000  avgt       50  7.674 ñ 0.048  ns/op
o.s.MyBenchmark.mapTest           5  avgt       50  6.180 ñ 0.170  ns/op
o.s.MyBenchmark.switchTest        1  avgt       50  3.714 ñ 0.047  ns/op
o.s.MyBenchmark.switchTest      100  avgt       50  3.784 ñ 0.146  ns/op
o.s.MyBenchmark.switchTest       10  avgt       50  3.602 ñ 0.016  ns/op
o.s.MyBenchmark.switchTest     1000  avgt       50  4.067 ñ 0.050  ns/op
o.s.MyBenchmark.switchTest        5  avgt       50  3.738 ñ 0.028  ns/op

Test 2 Results

Benchmark                     (arg)  Mode  Samples   Score   Error  Units
o.s.MyBenchmark.baseline       4000  avgt       30   5.427 ñ 0.071  ns/op
o.s.MyBenchmark.baseline       5501  avgt       30   5.435 ñ 0.099  ns/op
o.s.MyBenchmark.baseline       1000  avgt       30   5.530 ñ 0.149  ns/op
o.s.MyBenchmark.baseline       3000  avgt       30   5.371 ñ 0.053  ns/op
o.s.MyBenchmark.baseline       6000  avgt       30   5.424 ñ 0.102  ns/op
o.s.MyBenchmark.mapTest        4000  avgt       30   7.535 ñ 0.034  ns/op
o.s.MyBenchmark.mapTest        5501  avgt       30   6.203 ñ 0.226  ns/op
o.s.MyBenchmark.mapTest        1000  avgt       30   7.679 ñ 0.178  ns/op
o.s.MyBenchmark.mapTest        3000  avgt       30   7.561 ñ 0.056  ns/op
o.s.MyBenchmark.mapTest        6000  avgt       30  14.155 ñ 0.049  ns/op
o.s.MyBenchmark.switchTest     4000  avgt       30   4.446 ñ 0.044  ns/op
o.s.MyBenchmark.switchTest     5501  avgt       30   4.421 ñ 0.024  ns/op
o.s.MyBenchmark.switchTest     1000  avgt       30   4.497 ñ 0.021  ns/op
o.s.MyBenchmark.switchTest     3000  avgt       30   3.604 ñ 0.027  ns/op
o.s.MyBenchmark.switchTest     6000  avgt       30   4.448 ñ 0.034  ns/op

Test1.java

/*
 * Copyright (c) 2014, Oracle America, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 *  * Neither the name of Oracle nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.sample;

import java.util.HashMap;
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 org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;
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;

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

    final HashMap<Integer, String> map = new HashMap<Integer, String>() {
        {
            put(1, "a");
            put(10, "b");
            put(100, "c");
            put(1000, "d");
        }
    };

    @Param({"1", "100", "10", "1000", "5"})
    public Integer arg;

    @Benchmark
    public String baseline() {
        return "a";
    }

    @Benchmark
    public String switchTest() {
        switch (arg) {
            case 1:
                return "a";
            case 10:
                return "b";
            case 100:
                return "c";
            case 1000:
                return "d";
            default:
                return null;
        }
    }

    @Benchmark
    public String mapTest() {
        return map.get(arg);
    }

    public static void main(String[] args) throws RunnerException {
        Options opt = new OptionsBuilder()
                .include(MyBenchmark.class.getSimpleName())
                .warmupIterations(5)
                .measurementIterations(5)
                .build();

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

Test2.java

/*
 * Copyright (c) 2014, Oracle America, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 *  * Neither the name of Oracle nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.sample;

import java.util.HashMap;
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 org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;
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;

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

    final HashMap<Integer, String> map = new HashMap<Integer, String>() {
        {
            put(1, "a");
            put(10, "b");
            put(100, "c");
            put(1000, "d");
            put(2000, "e");
            put(2500, "f");
            put(3000, "g");
            put(3500, "h");
            put(4000, "i");
            put(4500, "j");
            put(5000, "k");
            put(5500, "l");
            put(6000, "m");
        }
    };

    @Param({"4000", "5501", "1000", "3000", "6000"})
    public Integer arg;

    @Benchmark
    public String baseline() {
        return "a";
    }

    @Benchmark
    public String switchTest() {
        switch (arg) {
            case 1:
                return "a";
            case 10:
                return "b";
            case 100:
                return "c";
            case 1000:
                return "d";
            case 2000:
                return "e";
            case 2500:
                return "f";
            case 3000:
                return "g";
            case 3500:
                return "h";
            case 4000:
                return "i";
            case 4500:
                return "j";
            case 5000:
                return "k";
            case 5500:
                return "l";
            case 6000:
                return "m";
            default:
                return null;
        }
    }

    @Benchmark
    public String mapTest() {
        return map.get(arg);
    }

    public static void main(String[] args) throws RunnerException {
        Options opt = new OptionsBuilder()
                .include(MyBenchmark.class.getSimpleName())
                .warmupIterations(3)
                .measurementIterations(3)
                .build();

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