1 /* 2 * Copyright (C) 2009 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 17 package benchmarks.regression; 18 19 import com.google.caliper.Param; 20 21 /** 22 * Tests the performance of various StringBuilder methods. 23 */ 24 public class StringBuilderBenchmark { 25 26 @Param({"1", "10", "100"}) private int length; 27 28 public void timeAppendBoolean(int reps) { 29 for (int i = 0; i < reps; ++i) { 30 StringBuilder sb = new StringBuilder(); 31 for (int j = 0; j < length; ++j) { 32 sb.append(true); 33 } 34 } 35 } 36 37 public void timeAppendChar(int reps) { 38 for (int i = 0; i < reps; ++i) { 39 StringBuilder sb = new StringBuilder(); 40 for (int j = 0; j < length; ++j) { 41 sb.append('c'); 42 } 43 } 44 } 45 46 public void timeAppendCharArray(int reps) { 47 char[] chars = "chars".toCharArray(); 48 for (int i = 0; i < reps; ++i) { 49 StringBuilder sb = new StringBuilder(); 50 for (int j = 0; j < length; ++j) { 51 sb.append(chars); 52 } 53 } 54 } 55 56 public void timeAppendCharSequence(int reps) { 57 CharSequence cs = "chars"; 58 for (int i = 0; i < reps; ++i) { 59 StringBuilder sb = new StringBuilder(); 60 for (int j = 0; j < length; ++j) { 61 sb.append(cs); 62 } 63 } 64 } 65 66 public void timeAppendSubCharSequence(int reps) { 67 CharSequence cs = "chars"; 68 for (int i = 0; i < reps; ++i) { 69 StringBuilder sb = new StringBuilder(); 70 for (int j = 0; j < length; ++j) { 71 sb.append(cs); 72 } 73 } 74 } 75 76 public void timeAppendDouble(int reps) { 77 double d = 1.2; 78 for (int i = 0; i < reps; ++i) { 79 StringBuilder sb = new StringBuilder(); 80 for (int j = 0; j < length; ++j) { 81 sb.append(d); 82 } 83 } 84 } 85 86 public void timeAppendFloat(int reps) { 87 float f = 1.2f; 88 for (int i = 0; i < reps; ++i) { 89 StringBuilder sb = new StringBuilder(); 90 for (int j = 0; j < length; ++j) { 91 sb.append(f); 92 } 93 } 94 } 95 96 public void timeAppendInt(int reps) { 97 int n = 123; 98 for (int i = 0; i < reps; ++i) { 99 StringBuilder sb = new StringBuilder(); 100 for (int j = 0; j < length; ++j) { 101 sb.append(n); 102 } 103 } 104 } 105 106 public void timeAppendLong(int reps) { 107 long l = 123; 108 for (int i = 0; i < reps; ++i) { 109 StringBuilder sb = new StringBuilder(); 110 for (int j = 0; j < length; ++j) { 111 sb.append(l); 112 } 113 } 114 } 115 116 public void timeAppendObject(int reps) { 117 // We don't want to time the toString, so ensure we're calling a trivial one... 118 Object o = new Object() { 119 @Override public String toString() { 120 return "constant"; 121 } 122 }; 123 for (int i = 0; i < reps; ++i) { 124 StringBuilder sb = new StringBuilder(); 125 for (int j = 0; j < length; ++j) { 126 sb.append(o); 127 } 128 } 129 } 130 131 public void timeAppendString(int reps) { 132 String s = "chars"; 133 for (int i = 0; i < reps; ++i) { 134 StringBuilder sb = new StringBuilder(); 135 for (int j = 0; j < length; ++j) { 136 sb.append(s); 137 } 138 } 139 } 140 } 141
