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 StringBuilders {
39
40 private String[] strings;
41 private String[] str3p4p2;
42 private String[] str16p8p7;
43 private String[] str3p9p8;
44 private String[] str22p40p31;
45
46 @Setup
47 public void setup() {
48 strings = new String[]{"As", "your", "attorney,", "I",
49 "advise", "you", "to", "drive", "at", "top", "speed", "it'll",
50 "be", "a", "god", "damn", "miracle", "if", "we", "can", "get",
51 "there", "before", "you", "turn", "into", "a", "wild", "animal."};
52 str3p4p2 = new String[]{"123", "1234", "12"};
53 str16p8p7 = new String[]{"1234567890123456", "12345678", "1234567"};
54 str3p9p8 = new String[]{"123", "123456789", "12345678"};
55 str22p40p31 = new String[]{"1234567890123456789012", "1234567890123456789012345678901234567890", "1234567890123456789012345678901"};
56 }
57
58 /** StringBuilder wins over StringMaker. */
59 @Benchmark
60 public String concat3p4p2() throws Exception {
61 return new StringBuilder(String.valueOf(str3p4p2[0])).append(str3p4p2[1]).append(str3p4p2[2]).toString();
62 }
63
64 /** StringBuilder wins over StringMaker. */
65 @Benchmark
66 public String concat16p8p7() throws Exception {
67 return new StringBuilder(String.valueOf(str16p8p7[0])).append(str16p8p7[1]).append(str16p8p7[2]).toString();
68 }
69
70 /** StringMaker wins over StringBuilder since the two last strings causes StringBuilder to do expand. */
71 @Benchmark
72 public String concat3p9p8() throws Exception {
73 return new StringBuilder(String.valueOf(str3p9p8[0])).append(str3p9p8[1]).append(str3p9p8[2]).toString();
74 }
75
76 /** StringMaker wins over StringBuilder. */
77 @Benchmark
78 public String concat22p40p31() throws Exception {
79 return new StringBuilder(String.valueOf(str22p40p31[0])).append(str22p40p31[1]).append(str22p40p31[2]).toString();
80 }
81
82 @Benchmark
83 public StringBuilder appendLoop8() {
84 StringBuilder sb = new StringBuilder();
85 for (int i = 0; i < 8; i++) {
86 sb.append(strings[i]);
87 }
88 return sb;
89 }
90
91 @Benchmark
92 public StringBuilder appendLoop16() {
93 StringBuilder sb = new StringBuilder();
94 for (int i = 0; i < 16; i++) {
95 sb.append(strings[i]);
96 }
97 return sb;
98 }
99
100 @Benchmark
101 public String toStringCharWithChar1() {
102 StringBuilder result = new StringBuilder();
103 result.append('a');
104 return result.toString();
105 }
106
107 @Benchmark
108 public String toStringCharWithChar2() {
109 StringBuilder result = new StringBuilder();
110 result.append('a');
111 result.append('p');
112 return result.toString();
113 }
114
115
116 @Benchmark
117 public String toStringCharWithChar4() {
118 StringBuilder result = new StringBuilder();
119 result.append('a');
120 result.append('p');
121 result.append('a');
122 result.append(' ');
123 return result.toString();
124 }
125
126 @Benchmark
127 public String toStringCharWithChar8() {
128 StringBuilder result = new StringBuilder();
129 result.append('a');
130 result.append('p');
131 result.append('a');
132 result.append(' ');
133 result.append('a');
134 result.append('p');
135 result.append('a');
136 result.append(' ');
137 return result.toString();
138 }
139
140 @Benchmark
141 public String toStringCharWithChar16() {
142 StringBuilder result = new StringBuilder();
143 result.append('a');
144 result.append('b');
145 result.append('c');
146 result.append('d');
147 result.append('e');
148 result.append('f');
149 result.append('g');
150 result.append('h');
151 result.append('i');
152 result.append('j');
153 result.append('k');
154 result.append('l');
155 result.append('m');
156 result.append('n');
157 result.append('o');
158 result.append('p');
159 return result.toString();
160 }
161
162
163 @Benchmark
164 public String toStringCharWithString8() {
165 StringBuilder result = new StringBuilder();
166 result.append("a");
167 result.append("b");
168 result.append("c");
169 result.append("d");
170 result.append("e");
171 result.append("f");
172 result.append("g");
173 result.append("h");
174 return result.toString();
175 }
176
177
178 @Benchmark
179 public String toStringCharWithString16() {
180 StringBuilder result = new StringBuilder();
181 result.append("a");
182 result.append("b");
183 result.append("c");
184 result.append("d");
185 result.append("e");
186 result.append("f");
187 result.append("g");
188 result.append("h");
189 result.append("i");
190 result.append("j");
191 result.append("k");
192 result.append("l");
193 result.append("m");
194 result.append("n");
195 result.append("o");
196 result.append("p");
197 return result.toString();
198 }
199
200
201 @Benchmark
202 public String toStringCharWithInt8() {
203 StringBuilder result = new StringBuilder();
204 result.append(2048);
205 result.append(31337);
206 result.append(0xbeefcace);
207 result.append(9000);
208 result.append(4711);
209 result.append(1337);
210 result.append(2100);
211 result.append(2600);
212 return result.toString();
213 }
214
215
216 @Benchmark
217 public String toStringCharWithBool8() {
218 StringBuilder result = new StringBuilder();
219 result.append(true);
220 result.append(false);
221 result.append(true);
222 result.append(true);
223 result.append(false);
224 result.append(true);
225 result.append(false);
226 result.append(false);
227 return result.toString();
228 }
229
230
231 @Benchmark
232 public String toStringCharWithFloat8() {
233 StringBuilder result = new StringBuilder();
234 result.append(113.110F);
235 result.append(156456.36435637F);
236 result.append(65436434.64632F);
237 result.append(42654634.64540F);
238 result.append(63464351.64537F);
239 result.append(634564.645711F);
240 result.append(64547.64311F);
241 result.append(4763456341.64531F);
242 return result.toString();
243 }
244
245
246 @Benchmark
247 public String toStringCharWithMixed8() {
248 StringBuilder result = new StringBuilder();
249 result.append('a');
250 result.append("stringelinglinglinglong");
251 result.append('a');
252 result.append("stringelinglinglinglong");
253 result.append('a');
254 result.append("stringelinglinglinglong");
255 result.append('p');
256 result.append("stringelinglinglinglong");
257 return result.toString();
258 }
259 }