1 /*
 2  * Copyright (c) 2019, 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.Thread)
34 @Warmup(iterations = 5, time = 1)
35 @Measurement(iterations = 5, time = 1)
36 @Fork(value = 3)
37 public class StringEquals {
38 
39     public String test = new String("0123456789");
40     public String test2 = new String("tgntogjnrognagronagroangroarngorngaorng");
41     public String test3 = new String(test); // equal to test, but not same
42     public String test4 = new String("0123\u01FF");
43     public String test5 = new String(test4); // equal to test4, but not same
44     public String test6 = new String("0123456780");
45     public String test7 = new String("0123\u01FE");
46 
47     @Benchmark
48     public boolean different() {
49         return test.equals(test2);
50     }
51 
52     @Benchmark
53     public boolean equal() {
54         return test.equals(test3);
55     }
56 
57     @Benchmark
58     public boolean almostEqual() {
59         return test.equals(test6);
60     }
61 
62     @Benchmark
63     public boolean almostEqualUTF16() {
64         return test4.equals(test7);
65     }
66 
67     @Benchmark
68     public boolean differentCoders() {
69         return test.equals(test4);
70     }
71 
72     @Benchmark
73     public boolean equalsUTF16() {
74         return test5.equals(test4);
75     }
76 }
77