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Master Java — End to End

From core syntax to cloud-native microservices — 195+ tutorials grouped by topic and ordered by difficulty so you always know what to learn next.

195+Tutorials
9Topic Tracks
Java 8–21Covered
Beginner→ExpertAll Levels
🚀 Getting Started ☕ Core Java & OOP 📦 Collections & DSA 🌊 Streams & Functional ⚡ Concurrency 🔧 JVM & Performance 🏗️ Microservices 🔒 Security & Testing 🤖 Modern Java
🗺 Recommended Learning Path
1Core Java
→
2Collections
→
3Streams & Lambdas
→
4Concurrency
→
5Design Patterns
→
6JVM & GC
→
7Microservices
→
8Security
→
9Cloud Native
🚀

Getting Started 6 guides

Install Java, understand the ecosystem, and write your first program.

☕
BeginnerStart Here

Java Basics: Your First Steps into Java Programming

Beginner⏱ 10 min
Java

Java Evolution: Complete History Java 1 to 21

Beginner⏱ 12 min
Java 24New

Java 24 Features: Practical Use Cases

Intermediate⏱ 9 min
Tooling

Best Java IDEs: IntelliJ, Eclipse & VS Code Features

Beginner⏱ 8 min
Build

Maven vs Gradle: Build Tools Compared

Beginner⏱ 8 min
JDK

OpenJDK vs GraalVM vs Corretto: Which JDK to Use?

Beginner⏱ 7 min
☕

Core Java & OOP 8 guides

Object-oriented design, generics, exceptions, functional interfaces and modern language features.

🧱
OOPPopular

OOP vs Data-Oriented Programming in Java — when to use which paradigm

Intermediate⏱ 11 min
Functional

Higher-Order Functions in Java

Intermediate⏱ 8 min
PatternsPopular

Design Patterns: Practical Java Guide

Intermediate⏱ 14 min
Architecture

Clean Architecture in Java

Intermediate⏱ 10 min
JVM

JVM Languages: Kotlin vs Scala vs Groovy vs Java

Intermediate⏱ 10 min
Core

Java Cryptography: Hashing, Encryption & Keys

Intermediate⏱ 9 min
📦

Collections & Data Structures 6 guides

List, Map, Set internals, algorithms and complexity — essential for interviews and production code.

📦
CollectionsDeep Dive

Java Collections Framework: ArrayList, HashMap, LinkedList, TreeMap & more — internals explained

Intermediate⏱ 13 min
AlgorithmsPopular

Big-O Notation & Time Complexity in Java

Beginner⏱ 8 min
DSA

LRU Cache Implementation in Java

Intermediate⏱ 9 min
DSA

Red-Black Trees: Theory & Java Implementation

Advanced⏱ 11 min
InterviewPopular

Top 50 Java Interview Questions (2026)

Intermediate⏱ 20 min
Interview

Top 10 Java Mistakes and How to Avoid Them

Beginner⏱ 7 min
🌊

Streams & Functional Programming 4 guides

Lambdas, Stream API, Optional, method references and the functional paradigm in Java.

🌊
StreamsMost Read

Java Streams API Complete Guide — filter, map, reduce, collectors, parallel streams

Intermediate⏱ 12 min
FunctionalNew

Java Optional: Null Safety Done Right

Beginner⏱ 7 min
Functional

Higher-Order Functions & Functional Interfaces

Intermediate⏱ 8 min
Reactive

Reactive Programming in Java: Project Reactor & RxJava

Advanced⏱ 12 min
⚡

Concurrency & Multithreading 5 guides

Threads, executors, locks, CompletableFuture and virtual threads (Java 21+).

⚡
AdvancedPopular

Java Concurrency Deep Dive — threads, locks, executors, CompletableFuture, virtual threads

Advanced⏱ 16 min
Threads

Java Multithreading: Thread Lifecycle & Synchronization

Intermediate⏱ 14 min
Concurrency

CountDownLatch vs CyclicBarrier vs Semaphore

Advanced⏱ 9 min
Reactive

Reactive Streams: Backpressure & Non-Blocking I/O

Advanced⏱ 11 min
Async

Java Message Queues: JMS, Kafka & RabbitMQ

Intermediate⏱ 10 min
🔧

JVM, Memory & Performance 6 guides

GC algorithms, heap tuning, profiling, monitoring and JVM internals.

🧠
AdvancedDeep Dive

JVM Memory Management & GC Tuning — heap, stack, G1GC, ZGC and memory leaks

Advanced⏱ 14 min
PerformancePopular

Java Performance Optimization Techniques

Advanced⏱ 12 min
Profiling

Java Profiling: JProfiler, VisualVM & Async-Profiler

Intermediate⏱ 10 min
Monitoring

Java Monitoring: JMX, Micrometer & Prometheus

Intermediate⏱ 10 min
JDK

OpenJDK vs GraalVM vs Corretto: Performance Compared

Intermediate⏱ 9 min
ModernNew

Java at the Edge: GraalVM Native Image & Quarkus

Advanced⏱ 10 min
🏗️

Microservices & Architecture 7 guides

Distributed systems, event-driven design, service patterns and cloud-native Java.

🏗️
ArchitecturePopular

Microservices Architecture in Java — patterns, service mesh, API gateway and resilience

Advanced⏱ 15 min
Event-Driven

Event-Driven Architecture with Java & Kafka

Advanced⏱ 12 min
CQRS

Event Sourcing & CQRS in Java

Advanced⏱ 13 min
Integration

Enterprise Integration Patterns in Java

Advanced⏱ 11 min
Performance

Microservices Performance Tuning in Java

Advanced⏱ 11 min
Serverless

Serverless Java: AWS Lambda & Quarkus

Intermediate⏱ 11 min
CloudNew

Cloud-Native Java: Containers, K8s & Service Mesh

Advanced⏱ 12 min
🔒

Security & Testing 8 guides

Secure coding, cryptography, unit testing, code coverage and mutation testing.

🔒
SecurityPopular

Java Security Best Practices 2026 — OWASP, input validation, secrets management

Intermediate⏱ 12 min
Security

Secure Coding in Java: Common Vulnerabilities Fixed

Intermediate⏱ 11 min
API

Java API Security: JWT, OAuth2 & Rate Limiting

Intermediate⏱ 10 min
Crypto

Java Cryptography: AES, RSA & Digital Signatures

Advanced⏱ 11 min
Testing

Advanced Java Testing: JUnit 5, Mockito & Testcontainers

Intermediate⏱ 12 min
Testing

Code Coverage in Java: JaCoCo & SonarQube

Beginner⏱ 8 min
Testing

Mutation Testing with PIT: Beyond Line Coverage

Advanced⏱ 9 min
TestingNew

Contract Testing with Pact in Java Microservices

Advanced⏱ 10 min
🤖

Modern Java: AI, Cloud & Reactive 5 guides

Spring AI integration, LLMs, cloud-native patterns, and the latest Java ecosystem.

🤖
AINew 2026

Spring AI Guide: Build AI Applications with Java — embeddings, RAG, tool calling

Intermediate⏱ 13 min
AINew

Building AI Applications with Java in 2026

Intermediate⏱ 11 min
Cloud

Cloud-Native Java: Containers & Kubernetes

Advanced⏱ 12 min
Edge

Java at the Edge: GraalVM Native & Micronaut

Advanced⏱ 10 min
Serverless

Serverless Java on AWS Lambda & Azure Functions

Intermediate⏱ 11 min

Ready for the next track? 🌱

Spring Boot is the natural next step — dependency injection, REST APIs, JPA and microservices with Java.

Explore Spring Boot →

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