IndexOfBenchmark

package com.analogideas.benchmark;


import java.util.Random;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;

@State(Scope.Thread)
public class IndexOfBenchmark {
    static final int loops = 100000;
    static final Random rng = new Random(2017);
    static final String [] paths = new String[1000];
    static {
        for (int i = 0; i < paths.length; i++) {
            paths[i] = ((i & 1) == 0) ? randomName() : randomNameWithSlash();
        }
    }

    private static String randomName() {
        StringBuilder sb = new StringBuilder(32);
        int len = 10 + rng.nextInt(22);
        for (int i = 0; i < len; i++) {
            sb.append((char) ('a' + rng.nextInt(26)));
        }
        return sb.toString();
    }

    private static String randomNameWithSlash() {
        StringBuilder sb = new StringBuilder(32);
        int len1 = 5 + rng.nextInt(11);
        int len2 = 4 + rng.nextInt(11);
        for (int i = 0; i < len1; i++) {
            sb.append((char) ('a' + rng.nextInt(26)));
        }
        sb.append('/');
        for (int i = 0; i < len2; i++) {
            sb.append((char) ('a' + rng.nextInt(26)));
        }
        return sb.toString();
    }

    @Benchmark
    public static int StringIndexOfChar() {
        int acc = 0;
        for (String s : paths) {
            if (s.indexOf('/') > -1) {
                acc++;
            }
        }
        return acc;
    }

    @Benchmark
    public static int StringIndexOfString() {
        int acc = 0;
        for (String s : paths) {
            if (s.indexOf("/") > -1) {
                acc++;
            }
        }
        return acc;
    }
}