BAEL-2832: new java-strings-2 project, with tests and benchmar
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jose
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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>java-strings-2</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<packaging>jar</packaging>
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<name>java-strings-2</name>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-java</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../parent-java</relativePath>
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</parent>
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<dependencies>
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<dependency>
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<groupId>commons-io</groupId>
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<artifactId>commons-io</artifactId>
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<version>${commons-io.version}</version>
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</dependency>
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<dependency>
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<groupId>log4j</groupId>
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<artifactId>log4j</artifactId>
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<version>${log4j.version}</version>
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</dependency>
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<dependency>
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<groupId>commons-codec</groupId>
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<artifactId>commons-codec</artifactId>
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<version>${commons-codec.version}</version>
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</dependency>
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<!-- test scoped -->
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.openjdk.jmh</groupId>
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<artifactId>jmh-core</artifactId>
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<version>${jmh-core.version}</version>
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</dependency>
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<dependency>
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<groupId>org.openjdk.jmh</groupId>
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<artifactId>jmh-generator-annprocess</artifactId>
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<version>${jmh-core.version}</version>
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</dependency>
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<dependency>
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<groupId>com.ibm.icu</groupId>
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<artifactId>icu4j</artifactId>
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<version>${icu4j.version}</version>
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</dependency>
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<dependency>
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<groupId>com.google.guava</groupId>
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<artifactId>guava</artifactId>
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<version>${guava.version}</version>
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</dependency>
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<dependency>
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<groupId>com.vdurmont</groupId>
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<artifactId>emoji-java</artifactId>
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<version>${emoji-java.version}</version>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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<version>${commons-lang3.version}</version>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>${junit.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<version>${junit-jupiter-api.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.hamcrest</groupId>
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<artifactId>hamcrest-library</artifactId>
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<version>${hamcrest-library.version}</version>
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<scope>test</scope>
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</dependency>
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<!-- Added for password generation -->
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<dependency>
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<groupId>org.passay</groupId>
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<artifactId>passay</artifactId>
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<version>${passay.version}</version>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-text</artifactId>
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<version>${commons-text.version}</version>
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</dependency>
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<dependency>
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<groupId>org.ahocorasick</groupId>
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<artifactId>ahocorasick</artifactId>
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<version>${ahocorasick.version}</version>
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</dependency>
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</dependencies>
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<build>
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<finalName>java-strings-2</finalName>
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<resources>
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<resource>
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<directory>src/main/resources</directory>
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<filtering>true</filtering>
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</resource>
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</resources>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>${maven-compiler-plugin.version}</version>
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<configuration>
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<source>${java.version}</source>
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<target>${java.version}</target>
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<compilerArgument>-parameters</compilerArgument>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<properties>
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<!-- util -->
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<commons-lang3.version>3.8.1</commons-lang3.version>
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<commons-codec.version>1.10</commons-codec.version>
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<!-- testing -->
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<assertj.version>3.6.1</assertj.version>
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<jmh-core.version>1.19</jmh-core.version>
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<icu4j.version>61.1</icu4j.version>
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<guava.version>27.0.1-jre</guava.version>
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<emoji-java.version>4.0.0</emoji-java.version>
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<junit-jupiter-api.version>5.3.1</junit-jupiter-api.version>
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<hamcrest-library.version>1.3</hamcrest-library.version>
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<passay.version>1.3.1</passay.version>
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<commons-text.version>1.4</commons-text.version>
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<ahocorasick.version>0.4.0</ahocorasick.version>
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</properties>
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</project>
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package com.baeldung.string.search.performance;
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import java.util.concurrent.TimeUnit;
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import java.util.regex.Pattern;
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import org.apache.commons.lang3.StringUtils;
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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.Mode;
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import org.openjdk.jmh.annotations.OutputTimeUnit;
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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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/**
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* Based on https://github.com/tedyoung/indexof-contains-benchmark
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*/
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@Fork(5)
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@State(Scope.Benchmark)
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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public class SubstringSearchPerformanceComparison {
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private String message;
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private Pattern pattern;
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public static void main(String[] args) throws Exception {
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org.openjdk.jmh.Main.main(args);
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}
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@Setup
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public void setup() {
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message = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum";
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pattern = Pattern.compile("(?<!\\S)" + "eiusmod" + "(?!\\S)");
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}
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@Benchmark
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public int indexOf() {
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return message.indexOf("eiusmod");
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}
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@Benchmark
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public boolean contains() {
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return message.contains("eiusmod");
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}
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@Benchmark
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public boolean containsStringUtilsIgnoreCase() {
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return StringUtils.containsIgnoreCase(message, "eiusmod");
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}
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@Benchmark
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public boolean searchWithPattern() {
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return pattern.matcher(message).find();
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}
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<configuration>
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<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
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<encoder>
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<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
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</pattern>
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</encoder>
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</appender>
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<root level="INFO">
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<appender-ref ref="STDOUT" />
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</root>
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</configuration>
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package com.baeldung.string.search;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import org.apache.commons.lang3.StringUtils;
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import org.junit.Assert;
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import org.junit.Test;
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/**
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* BAEL-2832: Different ways to check if a Substring could be found in a String.
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*/
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public class SubstringSearch {
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@Test
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public void searchSubstringWithIndexOf() {
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Assert.assertEquals(9, "Bohemian Rhapsodyan".indexOf("Rhap"));
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// indexOf will return -1, because it's case sensitive
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Assert.assertEquals(-1, "Bohemian Rhapsodyan".indexOf("rhap"));
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// indexOf will return 9, because it's all lowercase
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Assert.assertEquals(9, "Bohemian Rhapsodyan".toLowerCase()
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.indexOf("rhap"));
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// it will return 6, because it's the first occurrence. Sorry Queen for being blasphemic
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Assert.assertEquals(6, "Bohemian Rhapsodyan".indexOf("an"));
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}
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@Test
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public void searchSubstringWithContains() {
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Assert.assertTrue("Hey Ho, let's go".contains("Hey"));
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// contains will return false, because it's case sensitive
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Assert.assertFalse("Hey Ho, let's go".contains("hey"));
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// contains will return true, because it's all lowercase
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Assert.assertTrue("Hey Ho, let's go".toLowerCase().contains("hey"));
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// contains will return false, because 'jey' can't be found
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Assert.assertFalse("Hey Ho, let's go".contains("jey"));
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}
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@Test
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public void searchSubstringWithStringUtils() {
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Assert.assertTrue(StringUtils.containsIgnoreCase("Runaway train", "train"));
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// it will also be true, because ignores case ;)
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Assert.assertTrue(StringUtils.containsIgnoreCase("Runaway train", "Train"));
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}
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@Test
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public void searchUsingPattern() {
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// We create the Pattern first
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Pattern pattern = Pattern.compile("(?<!\\S)" + "road" + "(?!\\S)");
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// We need to create the Matcher after
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Matcher matcher = pattern.matcher("Hit the road Jack");
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// find will return true when the first match is found
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Assert.assertTrue(matcher.find());
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// We will create a different matcher with a different text
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matcher = pattern.matcher("and don't you come back no more");
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// find will return false, because 'road' can't be find as a substring
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Assert.assertFalse(matcher.find());
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}
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}
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*.class
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#folders#
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/target
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/neoDb*
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/data
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/src/main/webapp/WEB-INF/classes
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*/META-INF/*
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# Packaged files #
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*.jar
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*.war
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*.ear
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