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hashmap-concurrenthashmap: companion code for the HashMap vs ConcurrentHashMap interview guide

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Adds JMH put/get throughput benchmarks (synchronizedMap vs ConcurrentHashMap,
swept at 1/2/4/8 threads), a computeIfAbsent recursion trap demo (CHM tolerates
recursion into a different key but throws IllegalStateException on the same
key; plain HashMap throws ConcurrentModificationException even single-threaded),
and a null-handling demo (CHM rejects null keys/values on put() and null keys
on get() too). 7/7 JUnit tests pass; all output/ transcripts captured from
real runs.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01FhzLY5p6okFva3qsnsRyvM
This commit is contained in:
asmhatre
2026-09-30 09:29:06 +00:00
co-authored by Claude Sonnet 5
parent af615cc17c
commit 4a74153d87
16 changed files with 790 additions and 0 deletions
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hashmap-concurrenthashmap/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<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">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.ankurm</groupId>
<artifactId>java-core-examples</artifactId>
<version>1.0</version>
</parent>
<artifactId>hashmap-concurrenthashmap</artifactId>
<name>hashmap-concurrenthashmap</name>
<description>HashMap vs ConcurrentHashMap: JMH put/get throughput under concurrent load, the computeIfAbsent recursion trap (verified on both), and null-key/null-value handling.</description>
<properties>
<jmh.version>1.37</jmh.version>
</properties>
<dependencies>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${jmh.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh.version}</version>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>5.11.0</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>benchmarks</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.13.0</version>
<configuration>
<release>25</release>
<annotationProcessorPaths>
<path>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh.version}</version>
</path>
</annotationProcessorPaths>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>3.2.5</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.5.1</version>
<executions>
<execution>
<phase>package</phase>
<goals><goal>shade</goal></goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.openjdk.jmh.Main</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>