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The Java track.

Master Java from basics to advanced OOP, collections, multithreading and Java 8+ features. Built as a curriculum — 28 chapters, recommended spine if you're new, side-quests when you're ready.

⏱ ~29h 59m total 73 beginner · 125 intermediate · 59 advanced 📚 257 topics

You'll cover: Java Basics, Control Flow, Arrays — then go deeper.

Start here: Introduction to Java → JDK vs JRE vs JVM Explained → Java Program Structure →

Continue from Introduction to Java → Complete Java guide

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CURRICULUM

28 chapters · 257 topics

Java Basics

SPINEBeginner

13 topics · ~1h 31m · 0/13 read

Introduction to Java JDK vs JRE vs JVM Explained Java Program Structure Data Types in Java Variables and Constants in Java+8 more

Control Flow

SPINEBeginner

9 topics · ~1h 3m · 0/9 read

if-else Statement in Java switch Statement in Java for Loop in Java while and do-while Loop in Java break and continue in Java+4 more

Arrays

SPINEBeginner

8 topics · ~56m · 0/8 read

Arrays in Java Multi-dimensional Arrays in Java Array Sorting in Java Array Searching in Java Arrays Class in Java+3 more

OOP Concepts

SPINEIntermediate

16 topics · ~1h 52m · 0/16 read

Classes and Objects in Java Constructors in Java Inheritance in Java Polymorphism in Java Encapsulation in Java+11 more

Strings

SPINEBeginner

15 topics · ~1h 45m · 0/15 read

Strings in Java String Methods in Java StringBuilder and StringBuffer in Java String Formatting in Java Regular Expressions in Java+10 more

Exception Handling

SPINEIntermediate

20 topics · ~2h 20m · 0/20 read

Exception Handling in Java try-catch-finally in Java Custom Exceptions in Java throws and throw in Java Checked vs Unchecked Exceptions+15 more

Collections

SPINEIntermediate

21 topics · ~2h 27m · 0/21 read

Collections Framework Overview ArrayList in Java LinkedList in Java HashMap in Java HashSet in Java+16 more

Java 8+ Features

SPINEIntermediate

16 topics · ~1h 52m · 0/16 read

Lambda Expressions in Java Stream API in Java Optional Class in Java Functional Interfaces in Java Method References in Java+11 more

Multithreading

SPINEAdvanced

10 topics · ~1h 10m · 0/10 read

Multithreading in Java Thread Lifecycle in Java Synchronization in Java Executors and Thread Pools in Java volatile Keyword in Java+5 more

Java I/O

SPINEIntermediate

8 topics · ~56m · 0/8 read

File Handling in Java FileReader and FileWriter in Java BufferedReader and BufferedWriter Serialization in Java NIO in Java+3 more

Advanced Java

SPINEIntermediate

29 topics · ~3h 23m · 0/29 read

Generics in Java Reflection API in Java Annotations in Java Enums in Java Inner Classes in Java+24 more

Spring Boot

SPINEIntermediate

21 topics · ~2h 27m · 0/21 read

Spring Boot Application Properties Explained Spring Boot Project Structure Spring Boot Auto-Configuration Explained Building a REST API with Spring Boot Spring Boot Annotations Cheat Sheet+16 more

Hibernate & JPA

SPINEBeginner

7 topics · ~49m · 0/7 read

Introduction to Hibernate ORM Hibernate vs JPA — What's the Difference Hibernate Entity Mapping Explained One-to-Many and Many-to-Many in Hibernate HQL vs JPQL vs Native SQL+2 more

Build Tools

SPINEBeginner

5 topics · ~35m · 0/5 read

Maven Tutorial for Beginners Maven vs Gradle — Which Should You Use Understanding pom.xml in Maven Maven Dependency Management Explained Gradle Build Script Basics

Concurrency

SPINEIntermediate

6 topics · ~42m · 0/6 read

Java Threads and Runnable Explained Java Executor Service and Thread Pools synchronized Keyword in Java Java Locks and ReentrantLock Java CompletableFuture Explained+1 more

Spring Security

SPINEIntermediate

4 topics · ~28m · 0/4 read

Password Encoding and BCrypt in Spring Security OAuth2 with Spring Security Refresh Token with Spring Boot JWT Role-Based Access Control with Spring Security

Spring Cloud

Intermediate

9 topics · ~1h 3m · 0/9 read

Service Discovery with Spring Cloud Eureka API Gateway with Spring Cloud Gateway Feign Client in Spring Boot Microservices Circuit Breaker Pattern with Resilience4j Resilience4j — Retry, Circuit Breaker & Rate Limiting+4 more

Messaging

Intermediate

7 topics · ~49m · 0/7 read

Apache Kafka with Spring Boot — Getting Started Kafka Producer and Consumer in Spring Boot RabbitMQ with Spring Boot Dead Letter Queue in Spring Boot Event-Driven Architecture with Spring Boot+2 more

Microservices Patterns

Advanced

3 topics · ~21m · 0/3 read

Database-per-Service Pattern in Microservices Saga Pattern for Distributed Transactions CQRS Pattern in Spring Boot Microservices

Deployment

Intermediate

3 topics · ~21m · 0/3 read

Spring Boot Production Deployment Guide CI/CD for Spring Boot with GitHub Actions Deployment Rollback Strategies for Spring Boot

Performance

Advanced

1 topics · ~7m · 0/1 read

High Traffic Handling in Spring Boot

Production

Advanced

3 topics · ~21m · 0/3 read

Spring Boot Real-world Debugging Scenarios API Timeout Handling in Spring Boot Microservices Failure Recovery Patterns

Interview

Advanced

4 topics · ~28m · 0/4 read

Spring Boot Interview Questions Microservices Interview Questions Spring Security Interview Questions Design Patterns Interview Questions for Java

Basics

Beginner

1 topics · ~7m · 0/1 read

Java Pass by Value Explained

Android

Beginner

5 topics · ~35m · 0/5 read

Android NetworkOnMainThread Fix Android Cleartext HTTP Fix Android Insufficient Storage Install Fix Android dexBuilderDebug Failed Fix ADB Device Unauthorized Fix

Exceptions

Advanced

7 topics · ~49m · 0/7 read

Java FileNotFoundException Fix Java ExceptionInInitializer Fix Java UnsatisfiedLinkError Fix Java UnsupportedClassVersion Fix Java NoSuchFieldError Fix+2 more

Spring

Intermediate

5 topics · ~35m · 0/5 read

Spring NoSuchBeanDefinition Fix Spring BeanCreationException Fix Hibernate LazyInitialization Fix Spring Port 8080 Already in Use Fix Spring Could Not Autowire Fix

JVM

Intermediate

1 topics · ~7m · 0/1 read

Java Could Not Create JVM Fix

The Java track.

Java interview prep

28 chapters · 257 topics

Java Basics

Control Flow

Arrays

OOP Concepts

Strings

Exception Handling

Collections

Java 8+ Features

Multithreading

Java I/O

Advanced Java

Spring Boot

Hibernate & JPA

Build Tools

Concurrency

Spring Security

Spring Cloud

Messaging

Microservices Patterns

Deployment

Performance

Production

Interview

Basics

Android

Exceptions

Spring

JVM

Java Basics