Curated Collection of Java, Groovy, and Python Technical Articles

Language Collection

Java

One-line Java code to print a heart shape

Atomicity of operations and thread safety

Why i++ is unsafe

Composite atomic operations and thread safety

New solution for printing an equilateral triangle with a for‑loop

What actually runs before the main method?

What is really passed as parameters?

What happens when you put null into a JSON object?

Main thread ends but the process keeps running

How to test Java frameworks with Groovy scripts

Analyzing JVM heap to verify shallow vs deep copy

How to learn Java fundamentals

How to store HttpRequestBase and CloseableHttpResponse

Ensuring thread safety in anonymous Thread subclasses

Interface fields and instance methods in Java

Double‑checked locking for server‑side performance optimization

Fundamentals of Java concurrency bugs (Part 1)

Advanced Java concurrency bug patterns (Part 2)

Graphical visualization of performance test data

Huge objects causing excessive Full GC – bug share

Using ThreadLocal to solve synchronization issues

Are objects stored in thread‑safe collections themselves safe?

Parsing dates with the pattern "dd MM"

Using regular expressions in Java and Groovy

Java hot‑code that runs faster over time

Groovy

Resolving "cannot find matching method" errors when mixing Java and Groovy

Using Groovy streams to recursively find primes up to N

Performing Bash (shell) operations with Groovy

Easy database access using Groovy and Gradle

Enjoyable use of the Groovy Shell

Gradle + Groovy Basics

Gradle + Groovy Advanced Topics

Groovy operator overloading

Processing JMeter assertions and logs with Groovy

Manipulating JMeter variables using Groovy

Executing command‑line from JMeter with Groovy

Handling JMeter request parameters using Groovy

Regular expressions in Java and Groovy (duplicate entry)

Tuples in Groovy

The eight‑stage evolution from Java to Groovy

Using Groovy in JMeter for regex extraction and assignment

Python

Finding primes up to N with Python filter recursion (includes heart‑shape code analysis)

Finding primes up to N with Python filter recursion (duplicate entry)

Personal experience with Python‑based WeChat usage

Finding twin primes up to N using recursive filtering in Python

Building an auto‑reply WeChat bot with wxpy and requests