doom369

Benchmark                         Mode  Cnt   Score   Error  Units
Hashcode.apacheCommons            avgt   10   3.427 ± 0.025  ns/op
Hashcode.defaultHashCode          avgt   10   3.440 ± 0.028  ns/op
Hashcode.guava                    avgt   10   8.631 ± 0.098  ns/op
Hashcode.lombok                   avgt   10   3.502 ± 0.060  ns/op
Hashcode.objectsHashcode          avgt   10   8.722 ± 0.127  ns/op

doom369

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

Benchmark
EqualsIgnoreCase.equalsAndToLowerCase  HELLO WORLD  avgt   10  37.890 ± 0.547  ns/op
EqualsIgnoreCase.equalsIgnoreCase      HELLO WORLD  avgt   10  42.518 ± 0.451  ns/op

EqualsIgnoreCase.equalsAndToLowerCase  Hello World  avgt   10  33.204 ± 0.525  ns/op
EqualsIgnoreCase.equalsIgnoreCase      Hello World  avgt   10  27.891 ± 0.288  ns/op

EqualsIgnoreCase.equalsAndToLowerCase  hello world  avgt   10  18.047 ± 0.233  ns/op

doom369

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

    @Param({"http://facebook.com/loginMe", "Http://facebook.com/loginMe", "not url at all"})
    String url;

doom369

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

Benchmark                                                   (url)  Mode  Cnt   Score   Error  Units
StartsWith.regionMatches              http://facebook.com/loginMe  avgt   10   5.025 ± 0.032  ns/op
StartsWith.substringEqualsIgnoreCase  http://facebook.com/loginMe  avgt   10  19.390 ± 0.922  ns/op
StartsWith.toLowerCaseStartsWith      http://facebook.com/loginMe  avgt   10  40.815 ± 0.550  ns/op

StartsWith.regionMatches              Http://facebook.com/loginMe  avgt   10  14.469 ± 0.164  ns/op
StartsWith.substringEqualsIgnoreCase  Http://facebook.com/loginMe  avgt   10  21.758 ± 0.304  ns/op
StartsWith.toLowerCaseStartsWith      Http://facebook.com/loginMe  avgt   10  46.457 ± 0.643  ns/op

doom369

public boolean equalsIgnoreCase(String anotherString) {
    return (this == anotherString) ? true
            : (anotherString != null)
            && (anotherString.length() == length())
            && regionMatches(true, 0, anotherString, 0, length());
}

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 StringBuilderChaining {

    @Param({"sum"})
    private String leftFunction;

doom369

StringBuilder expression = new StringBuilder();
expression.append(leftFunction).append("(");
expression.append(alias).append(".");
expression.append(left).append(")");
expression.append(" ").append(op).append(" ");
expression.append(":").append(paramName);
return expression.toString();

doom369

return new StringBuilder()
.append(leftFunction).append("(")
.append(alias).append(".")
.append(left).append(")")
.append(" ").append(op).append(" ")
.append(":").append(paramName)
.toString();

doom369

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

doom369

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

Benchmark                                         Mode  Cnt    Score   Error  Units
StringBuilderChaining.chainingStringBuilder       avgt   10   51.790 ± 0.889  ns/op
StringBuilderChaining.concatMethod                avgt   10  144.281 ± 5.302  ns/op
StringBuilderChaining.explicitConcat              avgt   10   46.840 ± 0.460  ns/op
StringBuilderChaining.noChainingStringBuilder     avgt   10   73.528 ± 1.534  ns/op