1 /*
2 * Copyright (c) 2014, 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.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 private StringBuilder sbLatin1;
46 private StringBuilder sbUtf16;
47
48 @Setup
49 public void setup() {
50 strings = new String[]{"As", "your", "attorney,", "I",
51 "advise", "you", "to", "drive", "at", "top", "speed", "it'll",
52 "be", "a", "god", "damn", "miracle", "if", "we", "can", "get",
53 "there", "before", "you", "turn", "into", "a", "wild", "animal."};
54 str3p4p2 = new String[]{"123", "1234", "12"};
55 str16p8p7 = new String[]{"1234567890123456", "12345678", "1234567"};
56 str3p9p8 = new String[]{"123", "123456789", "12345678"};
57 str22p40p31 = new String[]{"1234567890123456789012", "1234567890123456789012345678901234567890", "1234567890123456789012345678901"};
58 sbLatin1 = new StringBuilder("Latin1 string");
59 sbUtf16 = new StringBuilder("UTF-\uFF11\uFF16 string");
60 }
61
62 /** StringBuilder wins over StringMaker. */
63 @Benchmark
64 public String concat3p4p2() throws Exception {
65 return new StringBuilder(String.valueOf(str3p4p2[0])).append(str3p4p2[1]).append(str3p4p2[2]).toString();
66 }
67
68 /** StringBuilder wins over StringMaker. */
69 @Benchmark
70 public String concat16p8p7() throws Exception {
71 return new StringBuilder(String.valueOf(str16p8p7[0])).append(str16p8p7[1]).append(str16p8p7[2]).toString();
72 }
73
74 /** StringMaker wins over StringBuilder since the two last strings causes StringBuilder to do expand. */
75 @Benchmark
76 public String concat3p9p8() throws Exception {
77 return new StringBuilder(String.valueOf(str3p9p8[0])).append(str3p9p8[1]).append(str3p9p8[2]).toString();
78 }
79
80 /** StringMaker wins over StringBuilder. */
81 @Benchmark
82 public String concat22p40p31() throws Exception {
83 return new StringBuilder(String.valueOf(str22p40p31[0])).append(str22p40p31[1]).append(str22p40p31[2]).toString();
84 }
85
86 @Benchmark
87 public StringBuilder appendLoop8() {
88 StringBuilder sb = new StringBuilder();
89 for (int i = 0; i < 8; i++) {
90 sb.append(strings[i]);
91 }
92 return sb;
93 }
94
95 @Benchmark
96 public StringBuilder appendLoop16() {
97 StringBuilder sb = new StringBuilder();
98 for (int i = 0; i < 16; i++) {
99 sb.append(strings[i]);
100 }
101 return sb;
102 }
103
104 @Benchmark
105 public String toStringCharWithChar1() {
106 StringBuilder result = new StringBuilder();
107 result.append('a');
108 return result.toString();
109 }
110
111 @Benchmark
112 public String toStringCharWithChar2() {
113 StringBuilder result = new StringBuilder();
114 result.append('a');
115 result.append('p');
116 return result.toString();
117 }
118
119
120 @Benchmark
121 public String toStringCharWithChar4() {
122 StringBuilder result = new StringBuilder();
123 result.append('a');
124 result.append('p');
125 result.append('a');
126 result.append(' ');
127 return result.toString();
128 }
129
130 @Benchmark
131 public String toStringCharWithChar8() {
132 StringBuilder result = new StringBuilder();
133 result.append('a');
134 result.append('p');
135 result.append('a');
136 result.append(' ');
137 result.append('a');
138 result.append('p');
139 result.append('a');
140 result.append(' ');
141 return result.toString();
142 }
143
144 @Benchmark
145 public String toStringCharWithChar16() {
146 StringBuilder result = new StringBuilder();
147 result.append('a');
148 result.append('b');
149 result.append('c');
150 result.append('d');
151 result.append('e');
152 result.append('f');
153 result.append('g');
154 result.append('h');
155 result.append('i');
156 result.append('j');
157 result.append('k');
158 result.append('l');
159 result.append('m');
160 result.append('n');
161 result.append('o');
162 result.append('p');
163 return result.toString();
164 }
165
166
167 @Benchmark
168 public String toStringCharWithString8() {
169 StringBuilder result = new StringBuilder();
170 result.append("a");
171 result.append("b");
172 result.append("c");
173 result.append("d");
174 result.append("e");
175 result.append("f");
176 result.append("g");
177 result.append("h");
178 return result.toString();
179 }
180
181
182 @Benchmark
183 public String toStringCharWithString16() {
184 StringBuilder result = new StringBuilder();
185 result.append("a");
186 result.append("b");
187 result.append("c");
188 result.append("d");
189 result.append("e");
190 result.append("f");
191 result.append("g");
192 result.append("h");
193 result.append("i");
194 result.append("j");
195 result.append("k");
196 result.append("l");
197 result.append("m");
198 result.append("n");
199 result.append("o");
200 result.append("p");
201 return result.toString();
202 }
203
204
205 @Benchmark
206 public String toStringCharWithInt8() {
207 StringBuilder result = new StringBuilder();
208 result.append(2048);
209 result.append(31337);
210 result.append(0xbeefcace);
211 result.append(9000);
212 result.append(4711);
213 result.append(1337);
214 result.append(2100);
215 result.append(2600);
216 return result.toString();
217 }
218
219
220 @Benchmark
221 public String toStringCharWithBool8() {
222 StringBuilder result = new StringBuilder();
223 result.append(true);
224 result.append(false);
225 result.append(true);
226 result.append(true);
227 result.append(false);
228 result.append(true);
229 result.append(false);
230 result.append(false);
231 return result.toString();
232 }
233
234
235 @Benchmark
236 public String toStringCharWithFloat8() {
237 StringBuilder result = new StringBuilder();
238 result.append(113.110F);
239 result.append(156456.36435637F);
240 result.append(65436434.64632F);
241 result.append(42654634.64540F);
242 result.append(63464351.64537F);
243 result.append(634564.645711F);
244 result.append(64547.64311F);
245 result.append(4763456341.64531F);
246 return result.toString();
247 }
248
249
250 @Benchmark
251 public String toStringCharWithMixed8() {
252 StringBuilder result = new StringBuilder();
253 result.append('a');
254 result.append("stringelinglinglinglong");
255 result.append('a');
256 result.append("stringelinglinglinglong");
257 result.append('a');
258 result.append("stringelinglinglinglong");
259 result.append('p');
260 result.append("stringelinglinglinglong");
261 return result.toString();
262 }
263
264 @Benchmark
265 public StringBuilder fromLatin1String() {
266 return new StringBuilder("Latin1 string");
267 }
268
269 @Benchmark
270 public StringBuilder fromUtf16String() {
271 return new StringBuilder("UTF-\uFF11\uFF16 string");
272 }
273
274 @Benchmark
275 public StringBuilder fromLatin1StringBuilder() {
276 return new StringBuilder(sbLatin1);
277 }
278
279 @Benchmark
280 public StringBuilder fromUtf16StringBuilder() {
281 return new StringBuilder(sbUtf16);
282 }
283 }