1 /* 2 * Copyright (C) 2019 The Android Open Source Project 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 public class StringBuilderAppendBenchmark { 18 public static String string1 = "s1"; 19 public static String string2 = "s2"; 20 public static String longString1 = "This is a long string 1"; 21 public static String longString2 = "This is a long string 2"; 22 public static int int1 = 42; 23 timeAppendStrings(int count)24 public void timeAppendStrings(int count) { 25 String s1 = string1; 26 String s2 = string2; 27 int sum = 0; 28 for (int i = 0; i < count; ++i) { 29 String result = s1 + s2; 30 sum += result.length(); // Make sure the append is not optimized away. 31 } 32 if (sum != count * (s1.length() + s2.length())) { 33 throw new AssertionError(); 34 } 35 } 36 timeAppendLongStrings(int count)37 public void timeAppendLongStrings(int count) { 38 String s1 = longString1; 39 String s2 = longString2; 40 int sum = 0; 41 for (int i = 0; i < count; ++i) { 42 String result = s1 + s2; 43 sum += result.length(); // Make sure the append is not optimized away. 44 } 45 if (sum != count * (s1.length() + s2.length())) { 46 throw new AssertionError(); 47 } 48 } 49 timeAppendStringAndInt(int count)50 public void timeAppendStringAndInt(int count) { 51 String s1 = string1; 52 int i1 = int1; 53 int sum = 0; 54 for (int i = 0; i < count; ++i) { 55 String result = s1 + i1; 56 sum += result.length(); // Make sure the append is not optimized away. 57 } 58 if (sum != count * (s1.length() + Integer.toString(i1).length())) { 59 throw new AssertionError(); 60 } 61 } 62 } 63