1 /*
   2  * Copyright (c) 2014, 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.Benchmark;
  26 import org.openjdk.jmh.annotations.BenchmarkMode;
  27 import org.openjdk.jmh.annotations.Mode;
  28 import org.openjdk.jmh.annotations.OutputTimeUnit;
  29 import org.openjdk.jmh.annotations.Scope;
  30 import org.openjdk.jmh.annotations.Setup;
  31 import org.openjdk.jmh.annotations.State;
  32 
  33 import java.util.concurrent.TimeUnit;
  34 
  35 @BenchmarkMode(Mode.AverageTime)
  36 @OutputTimeUnit(TimeUnit.NANOSECONDS)
  37 @State(Scope.Thread)
  38 public class StringUpperLower {
  39 
  40     private String strLowerCase;
  41     private String strMixedCase;
  42     private String strUpperCase;
  43 
  44     @Setup
  45     public void setup() {
  46         strLowerCase = "this is a simple string with different cases";
  47         strMixedCase = "This IS a SImpLE strING wITh DiFfErEnT CASeS";
  48         strUpperCase = "THIS IS A SIMPLE STRING WITH DIFFERENT CASES";
  49     }
  50 
  51     @Benchmark
  52     public String lowerToLower() {
  53         return strLowerCase.toLowerCase();
  54     }
  55 
  56     @Benchmark
  57     public String mixedToLower() {
  58         return strMixedCase.toLowerCase();
  59     }
  60 
  61     @Benchmark
  62     public String upperToLower() {
  63         return strUpperCase.toLowerCase();
  64     }
  65 
  66     @Benchmark
  67     public String lowerToUpper() {
  68         return strLowerCase.toUpperCase();
  69     }
  70 
  71     @Benchmark
  72     public String mixedToUpper() {
  73         return strMixedCase.toUpperCase();
  74     }
  75 
  76     @Benchmark
  77     public String upperToUpper() {
  78         return strUpperCase.toUpperCase();
  79     }
  80 
  81 }