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

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

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

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

doom369

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

doom369

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

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

@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

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

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