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 17 package benchmarks; 18 19 import com.google.caliper.Param; 20 import com.google.caliper.Runner; 21 import com.google.caliper.SimpleBenchmark; 22 23 import java.util.ArrayList; 24 25 /** 26 * Is a hand-coded counted loop through an ArrayList cheaper than enhanced for? 27 */ 28 public class ArrayListIterationBenchmark extends SimpleBenchmark { 29 ArrayList<Foo> mList = new ArrayList<Foo>(); 30 { 31 for (int i = 0; i < 27; ++i) mList.add(new Foo()); 32 } 33 public void timeArrayListIterationIndexed(int reps) { 34 for (int rep = 0; rep < reps; ++rep) { 35 int sum = 0; 36 ArrayList<Foo> list = mList; 37 int len = list.size(); 38 for (int i = 0; i < len; ++i) { 39 sum += list.get(i).mSplat; 40 } 41 } 42 } 43 public void timeArrayListIterationForEach(int reps) { 44 for (int rep = 0; rep < reps; ++rep) { 45 int sum = 0; 46 for (Foo a : mList) { 47 sum += a.mSplat; 48 } 49 } 50 } 51 } 52
