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