Java

Java is a statically typed, object-oriented language that compiles to bytecode and runs on the Java Virtual Machine, so the same build runs on any platform with a JVM. Its mature ecosystem includes the Collections framework, JDBC, JPA with Hibernate for data access and Spring Boot for web services. Java remains a mainstay for enterprise backends and large data systems, with a new long-term support release every two years.

74 articles

23/03/2024 13 min read

Practice: Build a Small Network Client or File Tool

Executive Summary: This practice project builds LinkCheck, a Java tool that reads URLs from a file, fetches each…
25/02/2024 12 min read

Modern Java Features: var, Text Blocks, and Pattern Matching

Executive Summary: Modern Java gives you var for local type inference, text blocks for multi-line strings, switch expressions…
12/02/2024 4 min read

Spring Boot REST API

Executive Summary: Java REST services without clear layering end up with fat controllers and brittle contracts. Here I…
05/02/2024 6 min read

Spring Boot Auto-Configuration: Your First REST Endpoint, Explained

Executive Summary: Spring Boot auto-configuration sets up the server, dependency injection, and JSON handling, so a REST endpoint…
28/01/2024 10 min read

Networking Basics in Java: Sockets and HTTP Clients

Executive Summary: Java networking ranges from raw TCP sockets to the built-in HttpClient. I cover ServerSocket and Socket…
20/01/2024 10 min read

Dependency Injection Concepts in Java

Executive Summary: Dependency injection means a class receives its collaborators, usually as interfaces through the constructor, instead of…
07/01/2024 10 min read

Serialization in Java: How It Works and Why to Avoid It

Executive Summary: Java serialization turns an object graph into bytes through Serializable, with serialVersionUID and transient controlling compatibility…
13/12/2023 4 min read

Understanding JVM Internals: From Source Code to Runtime

Executive Summary: Treating the JVM as a black box makes tuning and production debugging guesswork. Here I walk…
02/12/2023 11 min read

Java Modules (JPMS): Basics and Migration

Executive Summary: Java modules group packages behind a module-info.java file that declares what a module requires, exports, and…
04/11/2023 11 min read

Reflection in Java: Inspecting and Modifying Classes at Runtime

Executive Summary: Reflection lets Java code inspect and call classes at runtime through Class, Method, Field, and Constructor…
24/09/2023 10 min read

Annotations in Java: Built-in, Custom, and Retention Policies

Executive Summary: Java annotations are types declared with @interface whose elements hold compile-time constants. I cover built-ins like…
02/09/2023 12 min read

Practice: Process and Analyze a CSV with Streams

Executive Summary: This practice project analyzes a sales CSV with Java streams. You model rows as a validated…
12/08/2023 11 min read

NIO.2: Path, Files, and Modern File Handling

Executive Summary: NIO.2’s Path and Files replace string-built file paths and verbose IO code. I’ll cover building and…
08/07/2023 10 min read

File I/O in Java: Streams, Readers, and Writers

Executive Summary: Classic Java file I/O splits into byte streams for binary data and readers and writers for…