Programming Tutorials

leetcode.com Problem Statement Implement a Queue using Stack operations

Preventing Double-Spend in Spring Boot 3 Using Pessimistic SERIALIZABLE Locking The Problem Nobody Warns You About You build

Java makes it very easy to create images as BufferedImages which can then be saved out in standard image file formats. Here is the code to save an im

When I first started learning Java development, I often came across two terms: Spring and Spring Boot. At first, I assumed they were the same thing, b

When working with contracts, reports, notices, certificates, or other PDF files, the document layout often matters just as much as the content. For ex

If you’ve used Spring Boot REST APIs but haven’t explored Spring Integration yet, this project is a practical way to see what message-driven flow desi

I have worked as an SailPoint Engineer for 5+ years but was not happy with it and decided to transition to Backend Developer. But I am not getting a

O ecossistema Java está formalizando IA em produção. Este artigo apresenta os blocos concretos de construção para quem quer sair do protótipo e chegar

I just published the first article on my personal website: RentIt+ started as an HTL diploma project, but it quickly became much more than a typica

How inverting responsibility eliminated distributed lock contention from a high-throughput settlement pipeline When building the ingestion layer o

leetcode.com Problem Statement Given an integer array and an integer k,

=> Java, keywords and class names are case-sensitive. => Java keywords like (public, class, static, void) must be in lowercase. Error 1

Best Java Training at Kalyan Nagar — Complete Guide 2026 Are you looking for the best Java Training at Kalyan Nagar in 2026? You have come to the rig

OrderHub Day 1 stored orders in a HashMap — restart the server and they're gone. Day 2 fixes that: real persistence with JPA + PostgreSQL, and thanks

I took one realistic blocking Spring Boot 4 service — a PostgreSQL query through HikariCP plus a downstream HTTP call — flipped spring.threads.virtual

I recently built and deployed a Secure Notes Application from scratch to understand how a real-world full-stack app is designed, secured, and deployed

Stop Wasting LLM Budgets: High-Performance Semantic Caching with Spring AI and pgvector Your enterprise is likely bleeding thousands of dol

Here's a familiar feeling. You want to test one small thing in Java — maybe how String.substring() behaves, or whether a regex pattern matches. So you

Python Learning Roadmap for Beginners: From Zero to Job-Ready in 2026 Python has become one of the most popular programming languages in th

I built Oviora Builder: a lightweight native Android Java/XML CLI builder Android Studio is powerful, but for many beginners it is also hea