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BAEL-4494 | .toArray(new MyClass[0]) or .toArray(new MyClass[myList.size()])? (eugenp#10903)
* BAEL-4220 | A Guide to IllegalAccessError and when it happens * BAEL-4220 | A Guide to IllegalAccessError and when it happens | fix tests * BAEL-4220 | A Guide to IllegalAccessError and when it happens | fix tests * BAEL-4220 | A Guide to IllegalAccessError and when it happens | BDD test names * BAEL-4494 | .toArray(new MyClass[0]) or .toArray(new MyClass[myList.size()])? * BAEL-4494 | .toArray(new MyClass[0]) or .toArray(new MyClass[myList.size()])? Co-authored-by: root <[email protected]>
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‎core-java-modules/core-java-collections-4/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-collections-4</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>core-java-collections-4</name>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.baeldung.core-java-modules</groupId>
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<artifactId>core-java-modules</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-collections-4</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>core-java-collections-4</name>
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<packaging>jar</packaging>
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<dependencies>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<parent>
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<groupId>com.baeldung.core-java-modules</groupId>
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<artifactId>core-java-modules</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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<properties>
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<assertj.version>3.19.0</assertj.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<properties>
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<assertj.version>3.19.0</assertj.version>
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</properties>
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</project>

‎core-java-modules/core-java-collections-4/src/main/java/com/baeldung/collections/toarraycomparison/ToArrayBenchmark.java‎

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package com.baeldung.collections.toarraycomparison;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.TreeSet;
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import java.util.concurrent.TimeUnit;
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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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@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
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@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
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@Fork(value = 3, jvmArgsAppend = { "-XX:+UseParallelGC", "-Xms4g", "-Xmx4g" })
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@State(Scope.Benchmark)
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public class ToArrayBenchmark {
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@Param({ "10", "10000", "10000000" })
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private int size;
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@Param({ "array-list", "tree-set" })
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private String type;
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private Collection<String> collection;
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@Setup
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public void setup() {
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switch (type) {
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case "array-list":
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collection = new ArrayList<String>();
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break;
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case "tree-set":
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collection = new TreeSet<String>();
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break;
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default:
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throw new UnsupportedOperationException();
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}
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for (int i = 0; i < size; i++) {
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collection.add(String.valueOf(i));
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}
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}
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@Benchmark
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public String[] zero_sized() {
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return collection.toArray(new String[0]);
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}
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@Benchmark
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public String[] pre_sized() {
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return collection.toArray(new String[collection.size()]);
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}
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public static void main(String[] args) {
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try {
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org.openjdk.jmh.Main.main(args);
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}

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