Learn JAVA with Real Code Examples

Updated Nov 17, 2025

Introduction & Fundamentals Setup & Configuration Architecture & Deep Internals Performance & Security Development Workflow Learning & Career Growth Business & Strategy Examples

Learning Path

Learn Java basics & OOP

Master Collections & Streams

Learn Spring Boot

Learn Hibernate/JPA

Build enterprise projects

Skill Improvement Plan

Week 1: OOP + Collections

Week 2: Streams + Lambdas

Week 3: Spring Boot

Week 4: Databases + Microservices

Interview Questions

Explain OOP principles

What is the JVM?

What are streams and lambdas?

Explain garbage collection

What is Spring Boot?

Cheat Sheet

Common Java syntax patterns

Collections & Stream operators

Thread pool utilities

Spring annotations

Books

Effective Java

Java Concurrency in Practice

Head First Java

Tutorials

Java Tutorial by Oracle

Spring Boot Guides

Baeldung Java Tutorials

Official Docs

Java Official Documentation

Spring Boot Reference Guide

OpenJDK Documentation

Community Links

StackOverflow Java tag

Java Reddit communities

Spring Boot GitHub

Community Support

Large global Java developer community

Strong enterprise adoption

OpenJDK contributions

Huge Spring ecosystem