The Complete Java Course
A zero-to-advanced Java curriculum: from your very first line of code through object-oriented design, collections, concurrency, databases, the JVM, and professional software-development practices.
Phase 1 · Beginner
Syntax, variables, I/O, control flow, methods, arrays.
Introduction to Programming & Java
What programming really is, how computers run your code, what makes Java special, and writing your very first program.
Variables, Data Types & Operators
Store and manipulate data with primitives, literals, type conversion, and every operator Java offers.
Input, Output & Strings
Talk to the console, read user input with Scanner, and master Java's powerful String type.
Decision Making & Control Flow
Make your programs choose paths with if/else, the ternary operator, and modern switch expressions.
Loops
Repeat work efficiently with while, do-while, for, and enhanced-for loops — plus break, continue, and labels.
Methods & Program Decomposition
Break programs into reusable methods and understand parameters, return values, overloading, and recursion.
Arrays
Store collections of values in fixed-size arrays, iterate them, and run classic array algorithms.
Phase 2 · Object-Oriented Java
Classes, inheritance, interfaces, packages, exceptions.
Object-Oriented Programming Fundamentals
The heart of Java: classes, objects, constructors, encapsulation, and the static/final keywords.
Inheritance & Polymorphism
Model 'is-a' relationships, override behavior, and harness runtime polymorphism and abstract classes.
Interfaces, Enums, Records & Nested Types
Contracts with interfaces, type-safe constants with enums, concise data carriers with records, and nested types.
Packages, Access Control & Project Organization
Organize real projects with packages, imports, the classpath, JARs, and the Java module system.
Exception Handling
Handle failure gracefully with try/catch/finally, custom exceptions, and try-with-resources.
Phase 3 · Core Java
Generics, collections, APIs, lambdas, streams, files, regex.
Generics
Write type-safe, reusable code with generic classes, methods, bounded types, and wildcards.
Java Collections Framework
Master List, Set, Queue, and Map — and learn to choose the right collection for the job.
Object Class & Essential APIs
The methods every object inherits, wrapper types, big numbers, and Optional.
Date & Time API
Work with dates, times, durations, and time zones using the modern java.time API.
Functional Programming & Lambdas
Treat behavior as data with lambda expressions, functional interfaces, and method references.
Stream API
Process data declaratively with streams: filter, map, reduce, collect, group, and go parallel.
File Handling & I/O
Read and write files with byte and character streams, buffering, and the modern NIO.2 API.
Regular Expressions
Match, validate, and transform text with the power of regular expressions.
Phase 4 · Advanced Java
Concurrency, JDBC, networking, reflection, the JVM, modern Java.
Multithreading Fundamentals
Run code concurrently with threads — and learn to avoid race conditions and deadlocks.
Advanced Concurrency
Scale concurrency with executors, futures, locks, concurrent collections, and virtual threads.
Database Programming with JDBC
Connect Java to relational databases, run safe queries, manage transactions, and apply the DAO pattern.
Networking
Communicate over the network with HTTP clients, sockets, and TCP/UDP.
JSON, XML & Data Formats
Serialize and parse structured data with JSON, XML, and CSV, mapping it to Java objects.
Annotations & Reflection
Add metadata with annotations and inspect or invoke code at runtime with reflection.
JVM Internals & Memory Management
Look under the hood: class loading, the stack and heap, garbage collection, and the JIT.
Modern Java Language Features
Write cleaner code with var, text blocks, switch expressions, records, sealed classes, and more.
Phase 5 · Professional Development
Testing, builds, Git, clean code, patterns, security, performance.
Testing with JUnit
Prove your code works with automated tests, JUnit 5, mocking, and test-driven development.
Debugging, Logging & Profiling
Find and fix problems with the debugger, structured logging, and profiling tools.
Build Tools & Dependency Management
Automate builds and manage dependencies with Maven and Gradle.
Git & Professional Java Workflow
Track your work and collaborate with Git, GitHub, pull requests, and CI/CD.
Clean Code & Object-Oriented Design
Write code humans love to read with SOLID principles, cohesion, and refactoring.
Design Patterns
Solve recurring design problems with creational, structural, and behavioral patterns.
Algorithms & Data Structures in Java
Big-O, core data structures, and the searching, sorting, and DP algorithms that power interviews.
Security Fundamentals for Java Developers
Write secure code: validate input, store passwords safely, and avoid common vulnerabilities.
Advanced Architecture & Enterprise Concepts
Structure large applications with layers, DI, ORM, REST, and an intro to Spring Boot.
Performance Optimization
Measure, then optimize: algorithms, memory, I/O, caching, and JVM tuning.
Packaging, Deployment & Distribution
Package and ship Java apps with JARs, jlink, jpackage, and Docker.
Phase 6 · Portfolio
Progressively larger capstone projects.