1 /*
   2  * Copyright (c) 2018 Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.openjdk.bench.java.lang;
  24 
  25 import org.openjdk.jmh.annotations.*;
  26 import java.util.concurrent.TimeUnit;
  27 
  28 /*
  29  * This benchmark naively explores String::equals performance
  30  */
  31 @BenchmarkMode(Mode.AverageTime)
  32 @OutputTimeUnit(TimeUnit.NANOSECONDS)
  33 @State(Scope.Benchmark)
  34 public class StringEquals {
  35 
  36     public String test = new String("0123456789");
  37     public String test2 = new String("tgntogjnrognagronagroangroarngorngaorng");
  38     public String test3 = new String(test); // equal to test, but not same
  39     public String test4 = new String("0123\u01FF");
  40     public String test5 = new String(test4); // equal to test4, but not same
  41     public String test6 = new String("0123456780");
  42     public String test7 = new String("0123\u01FE");
  43 
  44     @Benchmark
  45     public boolean different() {
  46         return test.equals(test2);
  47     }
  48 
  49     @Benchmark
  50     public boolean equal() {
  51         return test.equals(test3);
  52     }
  53 
  54     @Benchmark
  55     public boolean almostEqual() {
  56         return test.equals(test6);
  57     }
  58 
  59     @Benchmark
  60     public boolean almostEqualUTF16() {
  61         return test4.equals(test7);
  62     }
  63 
  64     @Benchmark
  65     public boolean differentCoders() {
  66         return test.equals(test4);
  67     }
  68 
  69     @Benchmark
  70     public boolean equalsUTF16() {
  71         return test5.equals(test4);
  72     }
  73 }