StringIterationBenchmark.java revision 5a7833b406bb2716b057d3ed923f22f1f86b2a20 
1/*
2 * Copyright (C) 2010 Google Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package benchmarks;
18
19import com.google.caliper.Param;
20import com.google.caliper.Runner;
21import com.google.caliper.SimpleBenchmark;
22
23/**
24 * How do the various schemes for iterating through a string compare?
25 */
26public class StringIterationBenchmark extends SimpleBenchmark {
27    public void timeStringIteration0(int reps) {
28        String s = "hello, world!";
29        for (int rep = 0; rep < reps; ++rep) {
30            char ch;
31            for (int i = 0; i < s.length(); ++i) {
32                ch = s.charAt(i);
33            }
34        }
35    }
36    public void timeStringIteration1(int reps) {
37        String s = "hello, world!";
38        for (int rep = 0; rep < reps; ++rep) {
39            char ch;
40            for (int i = 0, length = s.length(); i < length; ++i) {
41                ch = s.charAt(i);
42            }
43        }
44    }
45    public void timeStringIteration2(int reps) {
46        String s = "hello, world!";
47        for (int rep = 0; rep < reps; ++rep) {
48            char ch;
49            char[] chars = s.toCharArray();
50            for (int i = 0, length = chars.length; i < length; ++i) {
51                ch = chars[i];
52            }
53        }
54    }
55    public void timeStringToCharArray(int reps) {
56        String s = "hello, world!";
57        for (int rep = 0; rep < reps; ++rep) {
58            char[] chars = s.toCharArray();
59        }
60    }
61}
62