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BAEL-1065 Added JMH benchmarks

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iaforek 2017-09-04 21:09:29 +01:00
parent 2127961922
commit 6c43977876
2 changed files with 449 additions and 392 deletions
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784
core-java/pom.xml
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@ -1,420 +1,456 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion> <modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId> <groupId>com.baeldung</groupId>
<artifactId>core-java</artifactId> <artifactId>core-java</artifactId>
<version>0.1.0-SNAPSHOT</version> <version>0.1.0-SNAPSHOT</version>
<packaging>jar</packaging> <packaging>jar</packaging>
<name>core-java</name> <name>core-java</name>
<dependencies> <dependencies>
<!-- utils --> <dependency>
<dependency> <groupId>org.openjdk.jmh</groupId>
<groupId>net.sourceforge.collections</groupId> <artifactId>jmh-core</artifactId>
<artifactId>collections-generic</artifactId> <version>1.19</version>
<version>${collections-generic.version}</version> </dependency>
</dependency> <dependency>
<dependency> <groupId>org.openjdk.jmh</groupId>
<groupId>com.google.guava</groupId> <artifactId>jmh-generator-annprocess</artifactId>
<artifactId>guava</artifactId> <version>1.19</version>
<version>${guava.version}</version> </dependency>
</dependency>
<dependency> <!-- utils -->
<groupId>org.apache.commons</groupId> <dependency>
<artifactId>commons-collections4</artifactId> <groupId>net.sourceforge.collections</groupId>
<version>${commons-collections4.version}</version> <artifactId>collections-generic</artifactId>
</dependency> <version>${collections-generic.version}</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
<dependency> <dependency>
<groupId>commons-io</groupId> <groupId>org.apache.commons</groupId>
<artifactId>commons-io</artifactId> <artifactId>commons-collections4</artifactId>
<version>${commons-io.version}</version> <version>${commons-collections4.version}</version>
</dependency> </dependency>
<dependency> <dependency>
<groupId>org.apache.commons</groupId> <groupId>commons-io</groupId>
<artifactId>commons-lang3</artifactId> <artifactId>commons-io</artifactId>
<version>${commons-lang3.version}</version> <version>${commons-io.version}</version>
</dependency> </dependency>
<dependency> <dependency>
<groupId>org.apache.commons</groupId> <groupId>org.apache.commons</groupId>
<artifactId>commons-math3</artifactId> <artifactId>commons-lang3</artifactId>
<version>${commons-math3.version}</version> <version>${commons-lang3.version}</version>
</dependency> </dependency>
<dependency> <dependency>
<groupId>org.decimal4j</groupId> <groupId>org.apache.commons</groupId>
<artifactId>decimal4j</artifactId> <artifactId>commons-math3</artifactId>
<version>${decimal4j.version}</version> <version>${commons-math3.version}</version>
</dependency> </dependency>
<dependency> <dependency>
<groupId>org.bouncycastle</groupId> <groupId>org.decimal4j</groupId>
<artifactId>bcprov-jdk15on</artifactId> <artifactId>decimal4j</artifactId>
<version>${bouncycastle.version}</version> <version>${decimal4j.version}</version>
</dependency> </dependency>
<dependency> <dependency>
<groupId>org.unix4j</groupId> <groupId>org.bouncycastle</groupId>
<artifactId>unix4j-command</artifactId> <artifactId>bcprov-jdk15on</artifactId>
<version>${unix4j.version}</version> <version>${bouncycastle.version}</version>
</dependency> </dependency>
<dependency> <dependency>
<groupId>com.googlecode.grep4j</groupId> <groupId>org.unix4j</groupId>
<artifactId>grep4j</artifactId> <artifactId>unix4j-command</artifactId>
<version>${grep4j.version}</version> <version>${unix4j.version}</version>
</dependency> </dependency>
<!-- web -->
<!-- marshalling --> <dependency>
<groupId>com.googlecode.grep4j</groupId>
<artifactId>grep4j</artifactId>
<version>${grep4j.version}</version>
</dependency>
<!-- web -->
<dependency> <!-- marshalling -->
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.version}</version>
</dependency>
<!-- logging --> <dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency> <!-- logging -->
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback.version}</version>
<!-- <scope>runtime</scope> -->
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>${org.slf4j.version}</version>
<!-- <scope>runtime</scope> --> <!-- some spring dependencies need to compile against jcl -->
</dependency>
<dependency> <!-- needed to bridge to slf4j for projects that use the log4j APIs directly -->
<groupId>org.slf4j</groupId>
<artifactId>log4j-over-slf4j</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<!-- test scoped --> <dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback.version}</version>
<!-- <scope>runtime</scope> -->
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>${org.slf4j.version}</version>
<!-- <scope>runtime</scope> --> <!-- some spring dependencies need to compile against jcl -->
</dependency>
<dependency> <!-- needed to bridge to slf4j for projects that use the log4j APIs directly -->
<groupId>org.slf4j</groupId>
<artifactId>log4j-over-slf4j</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<dependency> <!-- test scoped -->
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-all</artifactId>
<version>1.3</version>
<scope>test</scope>
</dependency>
<dependency> <dependency>
<groupId>junit</groupId> <groupId>org.hamcrest</groupId>
<artifactId>junit</artifactId> <artifactId>hamcrest-all</artifactId>
<version>${junit.version}</version> <version>1.3</version>
<scope>test</scope> <scope>test</scope>
</dependency> </dependency>
<dependency> <dependency>
<groupId>org.hamcrest</groupId> <groupId>junit</groupId>
<artifactId>hamcrest-core</artifactId> <artifactId>junit</artifactId>
<version>${org.hamcrest.version}</version> <version>${junit.version}</version>
<scope>test</scope> <scope>test</scope>
</dependency> </dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-library</artifactId>
<version>${org.hamcrest.version}</version>
<scope>test</scope>
</dependency>
<dependency> <dependency>
<groupId>org.assertj</groupId> <groupId>org.hamcrest</groupId>
<artifactId>assertj-core</artifactId> <artifactId>hamcrest-core</artifactId>
<version>${assertj.version}</version> <version>${org.hamcrest.version}</version>
<scope>test</scope> <scope>test</scope>
</dependency> </dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-library</artifactId>
<version>${org.hamcrest.version}</version>
<scope>test</scope>
</dependency>
<dependency> <dependency>
<groupId>org.mockito</groupId> <groupId>org.assertj</groupId>
<artifactId>mockito-core</artifactId> <artifactId>assertj-core</artifactId>
<version>${mockito.version}</version> <version>${assertj.version}</version>
<scope>test</scope> <scope>test</scope>
</dependency> </dependency>
<dependency>
<groupId>com.jayway.awaitility</groupId>
<artifactId>awaitility</artifactId>
<version>${avaitility.version}</version>
<scope>test</scope>
</dependency>
<dependency> <dependency>
<groupId>commons-codec</groupId> <groupId>org.mockito</groupId>
<artifactId>commons-codec</artifactId> <artifactId>mockito-core</artifactId>
<version>${commons-codec.version}</version> <version>${mockito.version}</version>
</dependency> <scope>test</scope>
</dependency>
<dependency>
<groupId>com.jayway.awaitility</groupId>
<artifactId>awaitility</artifactId>
<version>${avaitility.version}</version>
<scope>test</scope>
</dependency>
<dependency> <dependency>
<groupId>org.javamoney</groupId> <groupId>commons-codec</groupId>
<artifactId>moneta</artifactId> <artifactId>commons-codec</artifactId>
<version>1.1</version> <version>${commons-codec.version}</version>
</dependency> </dependency>
<dependency> <dependency>
<groupId>org.owasp.esapi</groupId> <groupId>org.javamoney</groupId>
<artifactId>esapi</artifactId> <artifactId>moneta</artifactId>
<version>2.1.0.1</version> <version>1.1</version>
</dependency> </dependency>
<dependency> <dependency>
<groupId>com.sun.messaging.mq</groupId> <groupId>org.owasp.esapi</groupId>
<artifactId>fscontext</artifactId> <artifactId>esapi</artifactId>
<version>${fscontext.version}</version> <version>2.1.0.1</version>
</dependency> </dependency>
</dependencies>
<build> <dependency>
<finalName>core-java</finalName> <groupId>com.sun.messaging.mq</groupId>
<resources> <artifactId>fscontext</artifactId>
<resource> <version>${fscontext.version}</version>
<directory>src/main/resources</directory> </dependency>
<filtering>true</filtering> </dependencies>
</resource>
</resources>
<plugins> <build>
<finalName>core-java</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
<plugin> <plugins>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin> <plugin>
<groupId>org.apache.maven.plugins</groupId> <groupId>org.codehaus.mojo</groupId>
<artifactId>maven-surefire-plugin</artifactId> <artifactId>exec-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>**/*IntegrationTest.java</exclude>
<exclude>**/*LongRunningUnitTest.java</exclude>
<exclude>**/*ManualTest.java</exclude>
</excludes>
<testFailureIgnore>true</testFailureIgnore>
</configuration>
</plugin>
<plugin> <executions>
<groupId>org.apache.maven.plugins</groupId> <execution>
<artifactId>maven-dependency-plugin</artifactId> <id>run-benchmarks</id>
<executions> <phase>integration-test</phase>
<execution> <goals>
<id>copy-dependencies</id> <goal>exec</goal>
<phase>prepare-package</phase> </goals>
<goals> <configuration>
<goal>copy-dependencies</goal> <classpathScope>test</classpathScope>
</goals> <executable>java</executable>
<configuration> <arguments>
<outputDirectory>${project.build.directory}/libs</outputDirectory> <argument>-classpath</argument>
</configuration> <classpath />
</execution> <argument>org.openjdk.jmh.Main</argument>
</executions> <argument>.*</argument>
</plugin> </arguments>
</configuration>
</execution>
</executions>
</plugin>
<plugin> <plugin>
<groupId>org.apache.maven.plugins</groupId> <groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId> <artifactId>maven-compiler-plugin</artifactId>
<configuration> <version>${maven-compiler-plugin.version}</version>
<archive> <configuration>
<manifest> <source>1.8</source>
<addClasspath>true</addClasspath> <target>1.8</target>
<classpathPrefix>libs/</classpathPrefix> </configuration>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass> </plugin>
</manifest>
</archive>
</configuration>
</plugin>
<plugin> <plugin>
<groupId>org.apache.maven.plugins</groupId> <groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId> <artifactId>maven-surefire-plugin</artifactId>
<executions> <configuration>
<execution> <excludes>
<phase>package</phase> <exclude>**/*IntegrationTest.java</exclude>
<goals> <exclude>**/*LongRunningUnitTest.java</exclude>
<goal>single</goal> <exclude>**/*ManualTest.java</exclude>
</goals> </excludes>
<configuration> <testFailureIgnore>true</testFailureIgnore>
<archiveBaseDirectory>${project.basedir}</archiveBaseDirectory> </configuration>
<archive> </plugin>
<manifest>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</execution>
</executions>
</plugin>
<plugin> <plugin>
<groupId>org.apache.maven.plugins</groupId> <groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId> <artifactId>maven-dependency-plugin</artifactId>
<executions> <executions>
<execution> <execution>
<goals> <id>copy-dependencies</id>
<goal>shade</goal> <phase>prepare-package</phase>
</goals> <goals>
<configuration> <goal>copy-dependencies</goal>
<shadedArtifactAttached>true</shadedArtifactAttached> </goals>
<transformers> <configuration>
<transformer <outputDirectory>${project.build.directory}/libs</outputDirectory>
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer"> </configuration>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass> </execution>
</transformer> </executions>
</transformers> </plugin>
</configuration>
</execution>
</executions>
</plugin>
<plugin> <plugin>
<groupId>com.jolira</groupId> <groupId>org.apache.maven.plugins</groupId>
<artifactId>onejar-maven-plugin</artifactId> <artifactId>maven-jar-plugin</artifactId>
<executions> <configuration>
<execution> <archive>
<configuration> <manifest>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass> <addClasspath>true</addClasspath>
<attachToBuild>true</attachToBuild> <classpathPrefix>libs/</classpathPrefix>
<filename>${project.build.finalName}-onejar.${project.packaging}</filename> <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
</configuration> </manifest>
<goals> </archive>
<goal>one-jar</goal> </configuration>
</goals> </plugin>
</execution>
</executions>
</plugin>
<plugin> <plugin>
<groupId>org.springframework.boot</groupId> <groupId>org.apache.maven.plugins</groupId>
<artifactId>spring-boot-maven-plugin</artifactId> <artifactId>maven-assembly-plugin</artifactId>
<executions> <executions>
<execution> <execution>
<goals> <phase>package</phase>
<goal>repackage</goal> <goals>
</goals> <goal>single</goal>
<configuration> </goals>
<classifier>spring-boot</classifier> <configuration>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass> <archiveBaseDirectory>${project.basedir}</archiveBaseDirectory>
</configuration> <archive>
</execution> <manifest>
</executions> <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
</plugin> </manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</execution>
</executions>
</plugin>
<plugin> <plugin>
<groupId>org.codehaus.mojo</groupId> <groupId>org.apache.maven.plugins</groupId>
<artifactId>exec-maven-plugin</artifactId> <artifactId>maven-shade-plugin</artifactId>
<version>1.6.0</version> <executions>
<configuration> <execution>
<executable>java</executable> <goals>
<mainClass>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</mainClass> <goal>shade</goal>
<arguments> </goals>
<argument>-Xmx300m</argument> <configuration>
<argument>-XX:+UseParallelGC</argument> <shadedArtifactAttached>true</shadedArtifactAttached>
<argument>-classpath</argument> <transformers>
<classpath/> <transformer
<argument>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</argument> implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
</arguments> <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
</configuration> </transformer>
</plugin> </transformers>
</plugins> </configuration>
</execution>
</executions>
</plugin>
</build> <plugin>
<groupId>com.jolira</groupId>
<artifactId>onejar-maven-plugin</artifactId>
<executions>
<execution>
<configuration>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<attachToBuild>true</attachToBuild>
<filename>${project.build.finalName}-onejar.${project.packaging}</filename>
</configuration>
<goals>
<goal>one-jar</goal>
</goals>
</execution>
</executions>
</plugin>
<profiles> <plugin>
<profile> <groupId>org.springframework.boot</groupId>
<id>integration</id> <artifactId>spring-boot-maven-plugin</artifactId>
<build> <executions>
<plugins> <execution>
<plugin> <goals>
<groupId>org.apache.maven.plugins</groupId> <goal>repackage</goal>
<artifactId>maven-surefire-plugin</artifactId> </goals>
<executions> <configuration>
<execution> <classifier>spring-boot</classifier>
<phase>integration-test</phase> <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<goals> </configuration>
<goal>test</goal> </execution>
</goals> </executions>
<configuration> </plugin>
<excludes>
<exclude>**/*ManualTest.java</exclude>
</excludes>
<includes>
<include>**/*IntegrationTest.java</include>
</includes>
</configuration>
</execution>
</executions>
<configuration>
<systemPropertyVariables>
<test.mime>json</test.mime>
</systemPropertyVariables>
</configuration>
</plugin>
</plugins>
</build>
</profile>
</profiles>
<properties> <plugin>
<!-- marshalling --> <groupId>org.codehaus.mojo</groupId>
<jackson.version>2.8.5</jackson.version> <artifactId>exec-maven-plugin</artifactId>
<version>1.6.0</version>
<configuration>
<executable>java</executable>
<mainClass>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</mainClass>
<arguments>
<argument>-Xmx300m</argument>
<argument>-XX:+UseParallelGC</argument>
<argument>-classpath</argument>
<classpath />
<argument>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</argument>
</arguments>
</configuration>
</plugin>
</plugins>
<!-- logging --> </build>
<org.slf4j.version>1.7.21</org.slf4j.version>
<logback.version>1.1.7</logback.version>
<!-- util --> <profiles>
<guava.version>21.0</guava.version> <profile>
<commons-lang3.version>3.5</commons-lang3.version> <id>integration</id>
<bouncycastle.version>1.55</bouncycastle.version> <build>
<commons-codec.version>1.10</commons-codec.version> <plugins>
<commons-math3.version>3.6.1</commons-math3.version> <plugin>
<decimal4j.version>1.0.3</decimal4j.version> <groupId>org.apache.maven.plugins</groupId>
<commons-io.version>2.5</commons-io.version> <artifactId>maven-surefire-plugin</artifactId>
<commons-collections4.version>4.1</commons-collections4.version> <executions>
<collections-generic.version>4.01</collections-generic.version> <execution>
<unix4j.version>0.4</unix4j.version> <phase>integration-test</phase>
<grep4j.version>1.8.7</grep4j.version> <goals>
<lombok.version>1.16.12</lombok.version> <goal>test</goal>
<fscontext.version>4.6-b01</fscontext.version> </goals>
<configuration>
<excludes>
<exclude>**/*ManualTest.java</exclude>
</excludes>
<includes>
<include>**/*IntegrationTest.java</include>
</includes>
</configuration>
</execution>
</executions>
<configuration>
<systemPropertyVariables>
<test.mime>json</test.mime>
</systemPropertyVariables>
</configuration>
</plugin>
</plugins>
</build>
</profile>
</profiles>
<!-- testing --> <properties>
<org.hamcrest.version>1.3</org.hamcrest.version> <!-- marshalling -->
<junit.version>4.12</junit.version> <jackson.version>2.8.5</jackson.version>
<mockito.version>1.10.19</mockito.version>
<assertj.version>3.6.1</assertj.version>
<avaitility.version>1.7.0</avaitility.version>
<!-- maven plugins --> <!-- logging -->
<maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version> <org.slf4j.version>1.7.21</org.slf4j.version>
<maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version> <logback.version>1.1.7</logback.version>
</properties> <!-- util -->
<guava.version>21.0</guava.version>
<commons-lang3.version>3.5</commons-lang3.version>
<bouncycastle.version>1.55</bouncycastle.version>
<commons-codec.version>1.10</commons-codec.version>
<commons-math3.version>3.6.1</commons-math3.version>
<decimal4j.version>1.0.3</decimal4j.version>
<commons-io.version>2.5</commons-io.version>
<commons-collections4.version>4.1</commons-collections4.version>
<collections-generic.version>4.01</collections-generic.version>
<unix4j.version>0.4</unix4j.version>
<grep4j.version>1.8.7</grep4j.version>
<lombok.version>1.16.12</lombok.version>
<fscontext.version>4.6-b01</fscontext.version>
<!-- testing -->
<org.hamcrest.version>1.3</org.hamcrest.version>
<junit.version>4.12</junit.version>
<mockito.version>1.10.19</mockito.version>
<assertj.version>3.6.1</assertj.version>
<avaitility.version>1.7.0</avaitility.version>
<!-- maven plugins -->
<maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version>
<maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
</properties>
</project> </project>

57
core-java/src/main/java/com/baeldung/string/StringBufferStringBuilder.java
View File

@ -1,25 +1,46 @@
package com.baeldung.string; package com.baeldung.string;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.RunnerException;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;
public class StringBufferStringBuilder { public class StringBufferStringBuilder {
public static void main(String[] args) { public static void main(String[] args) throws RunnerException {
int iterations = 10000000; Options opt = new OptionsBuilder()
.include(StringBufferStringBuilder.class.getSimpleName())
.build();
System.gc(); new Runner(opt).run();
long startTime = System.currentTimeMillis();
StringBuffer stringBuffer = new StringBuffer("abc");
for (int i = 0; i < iterations; i++) {
stringBuffer.append("def");
}
System.out.println("Time taken by StringBuffer: " + (System.currentTimeMillis() - startTime) + "ms"); // Time taken by StringBuffer: 394ms
System.gc();
startTime = System.currentTimeMillis();
StringBuilder stringBuilder = new StringBuilder("abc");
for (int i = 0; i < iterations; i++) {
stringBuilder.append("def");
}
System.out.println("Time taken by StringBuilder: " + (System.currentTimeMillis() - startTime) + "ms"); // Time taken by StringBuilder: 129ms
} }
}
@State(Scope.Benchmark)
public static class MyState {
int iterations = 1000;
String initial = "abc";
String suffix = "def";
}
@Benchmark
public StringBuffer benchmarkStringBuffer(MyState state) {
StringBuffer stringBuffer = new StringBuffer(state.initial);
for (int i = 0; i < state.iterations; i++) {
stringBuffer.append(state.suffix);
}
return stringBuffer;
}
@Benchmark
public StringBuilder benchmarkStringBuilder(MyState state) {
StringBuilder stringBuilder = new StringBuilder(state.initial);
for (int i = 0; i < state.iterations; i++) {
stringBuilder.append(state.suffix);
}
return stringBuilder;
}
}