96 lines
3.0 KiB
Java
96 lines
3.0 KiB
Java
/*
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* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.openjdk.bench.java.util;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.BenchmarkMode;
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import org.openjdk.jmh.annotations.Fork;
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import org.openjdk.jmh.annotations.Measurement;
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import org.openjdk.jmh.annotations.Mode;
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import org.openjdk.jmh.annotations.OutputTimeUnit;
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import org.openjdk.jmh.annotations.Param;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.Setup;
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import org.openjdk.jmh.annotations.State;
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import org.openjdk.jmh.annotations.Warmup;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.LinkedHashMap;
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import java.util.Map;
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import java.util.concurrent.TimeUnit;
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
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@Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
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@Fork(3)
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@State(Scope.Thread)
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public class HashMapToArray {
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@Param({"0", "1", "10", "1000", "100000"})
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public int size;
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@Param({"HashMap", "LinkedHashMap"})
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public String mapType;
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private Map<Integer, Integer> map;
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@Setup
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public void setup() {
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switch (mapType) {
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case "HashMap":
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map = new HashMap<>();
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break;
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case "LinkedHashMap":
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map = new LinkedHashMap<>();
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break;
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default:
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throw new IllegalStateException();
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}
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for (int i = 0; i < size; i++) {
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map.put(i, i * i);
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}
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}
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@Benchmark
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public Object[] testKeySetToArray() {
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return map.keySet().toArray();
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}
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@Benchmark
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public Object[] testKeySetToArrayTyped() {
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return map.keySet().toArray(new Integer[0]);
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}
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@Benchmark
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public Object[] testValuesToArray() {
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return map.values().toArray();
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}
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@Benchmark
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public Object[] testValuesToArrayTyped() {
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return map.values().toArray(new Integer[0]);
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}
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}
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