1. Introduction Design patterns are reusable solutions to common software design problems. They provide a way to describe and document software

Explore different approaches to finding the first non-repeating character in a string.

Explore the factory design pattern.

Learn how to convert an instance of LocalDateTime to ZonedDateTime and vice versa.

Learn the different expression types available in Thymeleaf with examples.

Java does not provide an explicit way to iterate over two lists at the same time. We look at some techniques and libraries that can help us correlate data between two collections according to index.

A quick and practical overview of all reference types in Java.

Pattern matching, GraalVM into OpenJDK, transactional MDC, event sourcing, and Postgres as a Message Queue!

GraalVM in OpenJDK, entity listeners, MicroProfile 6.0, RabbitMQ vs Kafka, and data pipelines at scale!

Learn two ways to convert a string array to an integer array through examples

Learn two approaches to extracting a JAR file to a specified directory

A quick and practical guide to comparing JAR files.

A quick and practical guide to reading and writing from a hash table data structure in a thread-safe way using the ConcurrentHashMap class.

Learn three ways to convert a list of integers to a list of strings in Java.

Understand the difference between verifying a JWT and decoding a JWT and learn how to check for a JWT's expiry without throwing any exceptions.

Learn how to add watermarks to generated PDF and to an existing PDF using iText.

A quick and practical guide to retrying with delay in RxJava.

Learn how to use libraries from multiple repositories when working on a Gradle project and how to use GitHub Package Registry for authenticated repositories.

Java 19 introduces Virtual Threads, which are lightweight threads designed to improve application throughput. This is a preview language feature so must

Learn the difference between a thread and an executor service having a single worker thread.

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