1 /* 2 * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.openjdk.bench.java.lang; 24 25 import org.openjdk.jmh.annotations.Benchmark; 26 import org.openjdk.jmh.annotations.BenchmarkMode; 27 import org.openjdk.jmh.annotations.Mode; 28 import org.openjdk.jmh.annotations.OutputTimeUnit; 29 import org.openjdk.jmh.annotations.Scope; 30 import org.openjdk.jmh.annotations.Setup; 31 import org.openjdk.jmh.annotations.State; 32 import org.openjdk.jmh.infra.Blackhole; 33 34 import java.util.Random; 35 import java.util.concurrent.TimeUnit; 36 37 /** 38 * Trivial String concatenation benchmark. 39 */ 40 @BenchmarkMode(Mode.AverageTime) 41 @OutputTimeUnit(TimeUnit.NANOSECONDS) 42 @State(Scope.Thread) 43 public class StringConcat { 44 45 public int intValue = 4711; 46 47 public String stringValue = String.valueOf(intValue); 48 49 public Object objectValue = Long.valueOf(intValue); 50 51 public boolean boolValue = true; 52 53 public byte byteValue = (byte)-128; 54 55 @Benchmark 56 public String concatConstInt() { 57 return "string" + intValue; 58 } 59 60 @Benchmark 61 public String concatConstString() { 62 return "string" + stringValue; 63 } 64 65 @Benchmark 66 public String concatMethodConstString() { 67 return "string".concat(stringValue); 68 } 69 70 @Benchmark 71 public String concatConstIntConstInt() { 72 return "string" + intValue + "string" + intValue; 73 } 74 75 @Benchmark 76 public String concatConstStringConstInt() { 77 return "string" + stringValue + "string" + intValue; 78 } 79 80 @Benchmark 81 public String concatConst4String() { 82 return "string" + stringValue + stringValue + stringValue + stringValue; 83 } 84 85 @Benchmark 86 public String concat4String() { 87 return stringValue + stringValue + stringValue + stringValue; 88 } 89 90 @Benchmark 91 public String concatConst2String() { 92 return "string" + stringValue + stringValue; 93 } 94 95 @Benchmark 96 public String concatConstBoolByte() { 97 return "string" + boolValue + byteValue; 98 } 99 100 @Benchmark 101 public String concatConst6String() { 102 return "string" + stringValue + stringValue + stringValue + stringValue + stringValue + stringValue; 103 } 104 105 @Benchmark 106 public String concat6String() { 107 return stringValue + stringValue + stringValue + stringValue + stringValue + stringValue; 108 } 109 110 @Benchmark 111 public String concatConst6Object() { 112 return "string" + objectValue + objectValue + objectValue + objectValue + objectValue + objectValue; 113 } 114 115 }