doom369

JDK 1.8.0_265, OpenJDK 64-Bit Server VM, 25.265-b01

Benchmark                                         Mode  Cnt   Score   Error  Units
StringBuilderChaining.chainingStringBuilder       avgt   10  72.675 ± 1.548  ns/op
StringBuilderChaining.noChainingStringBuilder     avgt   10  73.132 ± 2.126  ns/op
StringBuilderChaining.explicitConcat              avgt   10  71.821 ± 1.274  ns/op

JDK 11.0.8, OpenJDK 64-Bit Server VM, 11.0.8+10 -XX:-OptimizeStringConcat

Benchmark                                          Mode  Cnt    Score   Error  Units

doom369

return leftFunction.concat("(")
           .concat(alias).concat(".")
           .concat(left).concat(")")
           .concat(" ").concat(op).concat(" ")
           .concat(":").concat(paramName);

doom369

JDK 11.0.8, OpenJDK 64-Bit Server VM, 11.0.8+10

Benchmark                                            Mode  Cnt   Score   Error  Units
StringBuilderChainingFailure.noChaining              avgt   10  56.246 ± 2.295  ns/op
StringBuilderChainingFailure.explicitConcat          avgt   10  54.642 ± 0.696  ns/op
StringBuilderChainingFailure.explicitConcatImproved  avgt   10  50.153 ± 0.597  ns/op

doom369

@BenchmarkMode(Mode.AverageTime)
@Fork(value = 1)
@State(Scope.Thread)
@Warmup(iterations = 5, time = 1)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Measurement(iterations = 10, time = 1)
public class StringBuilderChainingFailure {

    String[] sqlColumnNames;

doom369

    public static WidgetProperty valueOfSwitch(String value) {
        switch (value) {
            case "LABEL" :
                return WidgetProperty.LABEL;
            case "COLOR" :
                return WidgetProperty.COLOR;
            case "ON_LABEL" :
                return WidgetProperty.ON_LABEL;
            case "OFF_LABEL" :
                return WidgetProperty.OFF_LABEL;

doom369

@BenchmarkMode(Mode.AverageTime)
@Fork(1)
@State(Scope.Thread)
@Warmup(iterations = 5, time = 1)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Measurement(iterations = 10, time = 1)
public class EnumValueOf {

    @Param({"LABEL", "ON_LABEL", "MAX"})
    String strParams;

doom369

JDK 11.0.8, OpenJDK 64-Bit Server VM, 11.0.8+10

Benchmark                (strParams)  Mode  Cnt   Score   Error  Units
EnumValueOf.enumSwitch         LABEL  avgt   80   7.149 ± 0.030  ns/op
EnumValueOf.enumSwitch      ON_LABEL  avgt   80   7.758 ± 0.077  ns/op
EnumValueOf.enumSwitch           MAX  avgt   80   6.948 ± 0.083  ns/op
EnumValueOf.enumValueOf        LABEL  avgt   80  15.659 ± 0.450  ns/op
EnumValueOf.enumValueOf     ON_LABEL  avgt   80  14.734 ± 0.542  ns/op
EnumValueOf.enumValueOf          MAX  avgt   80  15.153 ± 0.578  ns/op

doom369

    public static <T extends Enum<T>> T valueOf(Class<T> enumType,
                                                String name) {
        T result = enumType.enumConstantDirectory().get(name);
        if (result != null)
            return result;
        if (name == null)
            throw new NullPointerException("Name is null");
        throw new IllegalArgumentException(
            "No enum constant " + enumType.getCanonicalName() + "." + name);
    }

doom369

    Map<String, T> enumConstantDirectory() {
        Map<String, T> directory = enumConstantDirectory;
        if (directory == null) {
            T[] universe = getEnumConstantsShared();
            if (universe == null)
                throw new IllegalArgumentException(
                    getName() + " is not an enum type");
            directory = new HashMap<>((int)(universe.length / 0.75f) + 1);
            for (T constant : universe) {
                directory.put(((Enum<?>)constant).name(), constant);

doom369

@BenchmarkMode(Mode.AverageTime)
@Fork(1)
@State(Scope.Thread)
@Warmup(iterations = 5, time = 1)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Measurement(iterations = 10, time = 1)
public class EnumValues {

    @Benchmark
    public void enumValuesMethod(Blackhole bh) {