@nkamphoa

Centralized Logging for Java Apps With ELK and Docker Compose

Sep 6, 2025 · 8 min read · 1. Introduction Debugging a distributed Java application by SSH-ing into individual servers to grep through log files is a nightmare. What if you could search and visualize all your Spring Boot logs from a single, powerful dashboard? In this tutorial...

Understand the Factory Method Pattern in Java

Jun 21, 2025 · 3 min read · 1. Introduction In object-oriented programming, the Factory Method Pattern is a widely used creational design pattern that provides a robust solution for object instantiation. Instead of creating objects directly using constructors, this pattern sugg...

Abstract Classes and Interfaces in Java

May 27, 2025 · 3 min read · Introduction In Java, both abstract classes and interfaces allow you to define contracts and shared behavior for other classes. But when should you use one over the other? This article explores the differences, use cases, and practical examples of ab...

Single Responsibility Principle in Java

May 17, 2025 · 4 min read · Introduction The Single Responsibility Principle (SRP) is the “S” in the SOLID principles of object-oriented design. It’s often mentioned, sometimes misunderstood, and rarely applied correctly in large Java applications. Definition: A class should h...

Why You Should Avoid `==` with Strings in Java

May 14, 2025 · 3 min read · Introduction String comparison in Java can be confusing for beginners — especially when using ==. While your code may compile, it might not behave as expected. In this tutorial, you'll learn how string comparison in Java actually works, why == fails ...