SConcatBenchmark.java

package org.osgl.util;

import org.osgl.$;
import org.osgl.util.S;

public class SConcatBenchmark {

    public static void main(String[] args) {
        final int WARMUP = 1000000;
        final int LOOP = 100000000;
        String result = null;
        String s1 = S.random(4), s2 = S.random(10), s3 = S.random(8);
        long ts = $.ms();
        for (int i = 0; i < WARMUP; ++i) {
            result = concat1(s1, s2, s3);
        }
        for (int i = 0; i < WARMUP; ++i) {
            result = concat2(s1, s2, s3);
        }
        for (int i = 0; i < WARMUP; ++i) {
            result = concat3(s1, s2, s3);
        }
        for (int i = 0; i < WARMUP; ++i) {
            result = concat4(s1, s2, s3);
        }
        System.out.println("it takes " + ($.ms() - ts) + "ms to finish warm up");

        ts = $.ms();
        for (int i = 0; i < LOOP; ++i) {
            result = concat1(s1, s2, s3);
        }
        long t1 = $.ms() - ts;

        ts = $.ms();
        for (int i = 0; i < LOOP; ++i) {
            result = concat2(s1, s2, s3);
        }
        long t2 = $.ms() - ts;

        ts = $.ms();
        for (int i = 0; i < LOOP; ++i) {
            result = concat3(s1, s2, s3);
        }
        long t3 = $.ms() - ts;

        ts = $.ms();
        for (int i = 0; i < LOOP; ++i) {
            result = concat4(s1, s2, s3);
        }
        long t4 = $.ms() - ts;

        System.out.println("String +: " + t1);
        System.out.println("StringBuilder: " + t2);
        System.out.println("osgl.S.concat: " + t3);
        System.out.println("osgl.StrBuffer: " + t4);
        System.out.println(result);
    }

    private static String concat1(String s1, String s2, String s3) {
        return s1 + s2 + s3;
    }

    private static String concat2(String s1, String s2, String s3) {
        return new StringBuilder(s1).append(s2).append(s3).toString();
    }

    private static String concat3(String s1, String s2, String s3) {
        return S.concat(s1, s2, s3);
    }

    private static String concat4(String s1, String s2, String s3) {
        return S.buffer(s1).a(s2).a(s3).toString();
    }

}

Running the above code on osgl-tool-1.2.0 shows the following result:

it takes 357ms to finish warm up
String +: 3164
StringBuilder: 1953
osgl.S.concat: 4513
osgl.StrBuffer: 3832
Ok_~Dbc@tbLS@a0JeX!o4p