Programming Tutorials

1. update Update records matching the given condition. Supports both Condition and List. // Single Condition public int update(String ta

This is one of the most common questions beginners ask. Here's an honest answer with no fluff. Python — the case for starting here Python

Learn what the @Autowired annotation in Spring Boot is, how dependency injection works, practical examples, best practices, and common mistakes to avo

Picture this familiar scenario: you're working on a new feature that requires a new database column. You open your local database client, write an ALT

O que você vai aprender: Como a JVM decide o que compilar e quando · A diferença real entre C1 e C2 · O que é o Code Cache e por que ele pode derruba

When you need to track down a complex bug, your first instinct is to reach for a visual debugger. You set a breakpoint, step through the logic, and in

The File class (java.io.File) is used to represent files and directories. A constructor is used to create a File object that points to a file or folde

Java LLD: Amazon Locker Design with SmallestFit Allocation Designing an Amazon Locker system is a favorite Low-Level Design (LLD) question

Learn the difference between Spring and Spring Boot with practical Java 21 examples, setup guides, REST APIs, benefits, and best practices for beginne

The web is evolving beyond traditional HTTP request-response patterns. Applications increasingly require low-latency, bidirectional communication, unr

Built a JWT Authentication Starter for Spring Boot 🚀 After setting up JWT authentication, filters, token validation, and Spring Security integration

1. The problem Many Java developers looking for a Socket.IO server eventually discover existing implementations, but often encounter: Limited maint

For a long time, the Factory pattern felt like ceremony to me — an extra class that did nothing my code couldn't already do. Then I thought about ten

Problem Link: https://leetcode.com/problems/two-sum/ The Two Sum problem is one of the most frequently asked coding interview questions. While the br

GitHub Account Management and Security Solutions: A Complete Guide for Developers and Digital Professionals ➤24/7 Fast Response Support ➤Telegram: @ge

Índice Introdução Criando o projeto no Spring Initializr Criando a classe WebSecurityConfig Criando o controller e fazendo a requisição

At some point, a monolith starts working against you. In my case, Finovara was a single Spring Boot application handling everything (authentication,

Given an integer array nums, return the number of reverse pairs. A reverse pair is defined as: i j && nums[i] > 2 * nums[j] Bru

Theory alone won't land you a job. Employers want candidates who have already written production-grade code, debugged real issues, and worked on liv

Learn what Dependency Injection is, why it matters in Spring Boot, and how to implement it using Java 21 with practical examples, REST APIs, and best