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Diffstat (limited to 'src/examples/StringBuilderBenchmark.java')
-rw-r--r-- | src/examples/StringBuilderBenchmark.java | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/src/examples/StringBuilderBenchmark.java b/src/examples/StringBuilderBenchmark.java new file mode 100644 index 0000000..35e34f7 --- /dev/null +++ b/src/examples/StringBuilderBenchmark.java @@ -0,0 +1,133 @@ +/* + * Copyright (C) 2009 Google Inc. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package examples; + +import com.google.caliper.Param; +import com.google.caliper.Runner; +import com.google.caliper.SimpleBenchmark; + +/** + * Tests the performance of various StringBuilder methods. + */ +public class StringBuilderBenchmark extends SimpleBenchmark { + + @Param({"1", "10", "100"}) private int length; + + public void timeAppendBoolean(int reps) { + for (int i = 0; i < reps; ++i) { + StringBuilder sb = new StringBuilder(); + for (int j = 0; j < length; ++j) { + sb.append(true); + } + } + } + + public void timeAppendChar(int reps) { + for (int i = 0; i < reps; ++i) { + StringBuilder sb = new StringBuilder(); + for (int j = 0; j < length; ++j) { + sb.append('c'); + } + } + } + + public void timeAppendCharArray(int reps) { + char[] chars = "chars".toCharArray(); + for (int i = 0; i < reps; ++i) { + StringBuilder sb = new StringBuilder(); + for (int j = 0; j < length; ++j) { + sb.append(chars); + } + } + } + + public void timeAppendCharSequence(int reps) { + CharSequence cs = "chars"; + for (int i = 0; i < reps; ++i) { + StringBuilder sb = new StringBuilder(); + for (int j = 0; j < length; ++j) { + sb.append(cs); + } + } + } + + public void timeAppendDouble(int reps) { + double d = 1.2; + for (int i = 0; i < reps; ++i) { + StringBuilder sb = new StringBuilder(); + for (int j = 0; j < length; ++j) { + sb.append(d); + } + } + } + + public void timeAppendFloat(int reps) { + float f = 1.2f; + for (int i = 0; i < reps; ++i) { + StringBuilder sb = new StringBuilder(); + for (int j = 0; j < length; ++j) { + sb.append(f); + } + } + } + + public void timeAppendInt(int reps) { + int n = 123; + for (int i = 0; i < reps; ++i) { + StringBuilder sb = new StringBuilder(); + for (int j = 0; j < length; ++j) { + sb.append(n); + } + } + } + + public void timeAppendLong(int reps) { + long l = 123; + for (int i = 0; i < reps; ++i) { + StringBuilder sb = new StringBuilder(); + for (int j = 0; j < length; ++j) { + sb.append(l); + } + } + } + + public void timeAppendObject(int reps) { + Object o = new Object(); + for (int i = 0; i < reps; ++i) { + StringBuilder sb = new StringBuilder(); + for (int j = 0; j < length; ++j) { + sb.append(o); + } + } + } + + public void timeAppendString(int reps) { + String s = "chars"; + for (int i = 0; i < reps; ++i) { + StringBuilder sb = new StringBuilder(); + for (int j = 0; j < length; ++j) { + sb.append(s); + } + } + } + + + // TODO: remove this from all examples when IDE plugins are ready + public static void main(String[] args) throws Exception { + Runner.main(StringBuilderBenchmark.class, args); + } +} |