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Good Day... During yesterday's training session, my trainer asked a simple yet interesting question: "What is args in Java? Can we rename it? How ar
If you've been working with Java for a while, you've probably used HashMap countless times. It's one of the most essential data structures in Java and
Lottie animations run on Android, iOS, and the web. Getting them working on the JVM is a different story. Lottie4J started as a question: can JavaFX r
My goal is to become a software architect. And the first step towards that? Becoming a really solid backend engineer. So naturally, in my infinite wi
An inversion is a pair of indices (i, j) such that: i arr[j] In simple words, an inversion tells us how far an array is from being sorted.
Java Collection Framework (JCF) is a set of classes and interfaces that provide ready-made data structures to store and manipulate groups of objects e
What is File Handling? File Handling in Java is the process of creating, reading, writing, updating, and deleting files stored on a storage
Stop Blocking Virtual Threads: Building Asynchronous Human-in-the-Loop AI Agents with Spring AI In 2026, letting autonomous AI agents execu
One number in the array appears twice, while another number from the range [1, n] is missing. Our task is to find both: Repeating Number (A) Missin
Problem Statement Given an array nums containing n + 1 integers where: Each integer is in the range [1, n] There is only one repeated nu
If you've been looking to deploy your Spring Boot app to the cloud but feel a little overwhelmed by all the moving pieces, don't worry, you're not alo
At first glance, this problem looks like a standard merge operation from Merge Sort. Most candidates immediately think about creating a temporary arr
Java remains one of the most sought-after programming languages in Bangalore's IT industry. But learning Java is not enough – employers want proof of
Hey everyone! This is my first post and I wanted to start sharing this project with you all. I've been experimenting with audio embeddings recently
One of the most common interval-based interview questions is Merge Intervals. At first glance, it looks like a simulation problem, but the real trick
Spring Boot 4 just shipped with native Jackson 3 support. Good moment to revisit how much Java we write when we work with JSON. If you've built a Spr
When I started learning Spring Security, I kept seeing two terms everywhere: Authentication and Authorization At first, they sounded almost the same
I Built a Vector Search Engine from Scratch — Here's What I Learned Implementing HNSW (Hierarchical Navigable Small World) graphs, hybrid
Matrix problems often seem tricky because multiple rows and columns move at the same time. In this problem, we need to rotate an n × n matrix by 90 de
Introduction In Java, constructors are used to initialize objects, while packages are used to organize classes and interfaces. Both concept