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Free Java Course - Learn OOP, Collections & Enterprise Java

Master Java programming with our free course. Learn OOP, collections, multithreading, and build enterprise applications.

12
Modules
35+
Hours
48+
Topics
5+
Projects

What's Inside Every Lesson?

Every topic is designed so complete beginners can follow along step by step

Interactive Code Editor

Write & run real code in the browser - no setup needed

Practice After Every Topic

Hands-on exercises reinforce what you just learned

Q&A Flip Cards

Common questions answered with simple explanations

Module Quizzes

Test your knowledge before moving to the next module

Mini Projects

Build real apps - a calculator, to-do list, and more

Visual Diagrams

Concepts explained with clear, annotated diagrams

Quick Peek - Your First Java Program
Beginner Friendly
// Your very first Java program!
public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
        System.out.println("Welcome to Java ☕");

        // Variables
        String name = "Alice";
        int age = 25;
        System.out.println("Name: " + name + ", Age: " + age);
    }
}
You'll write, edit, and run code exactly like this - right inside your browser, no installation needed!

Who This Course Is For

Targeted at Computer Science students, Android developers, and enterprise software engineers. Java remains the primary language for large-scale backend systems and Android development.

Prerequisites

Basic programming logic understanding. Experience with any scripting language is a plus but not required.

First published February 2024 · Updated 2026

What You'll Learn

  • Java fundamentals and OOP principles
  • Collections framework and data structures
  • Exception handling and file I/O
  • Multithreading and concurrent programming

Career Opportunities

Java Developer
Backend Engineer
Android Developer
Enterprise Developer
Start Learning Now

Course Modules Overview

1
Java Basics & Setup

4 topics

2
Variables, Data Types & Operators

4 topics

3
Control Flow & Loops

4 topics

4
Object-Oriented Programming

3 topics

5
Classes, Inheritance & Polymorphism

3 topics

6
Collections Framework

3 topics

7
Exception Handling

3 topics

8
File I/O & Streams

3 topics

9
Multithreading & Concurrency

3 topics

10
Java Project: Banking Application

4 topics

11
Spring Framework & Modern Java

4 topics

12
Java Career & Enterprise Development

4 topics

Keep Learning!

Complete all 12 modules to unlock your course completion certificate

Course Curriculum

12 comprehensive modules covering everything from basics to advanced topics

Beginner (3)Intermediate (3)Advanced (6)
Recommended Starting PointBegin your journey here →
Module 1

Java Basics & Setup

Learn java basics & setup with practical examples and exercises.

Beginner2 hours
▶️ 4 topics🧪 Practice exercises
Introduction to JavaJava Setup & InstallationVariables & Data TypesOperators & Expressions
🚀 Start Learning Now
Module 2

Variables, Data Types & Operators

Learn variables, data types & operators with practical examples and exercises.

Beginner2.5 hours
▶️ 4 topics🧪 Practice exercises
Declaring & Initializing VariablesPrimitive Data TypesArithmetic & Assignment OperatorsComparison & Logical Operators
Start Module
Module 3

Control Flow & Loops

Learn control flow & loops with practical examples and exercises.

Beginner2 hours
▶️ 4 topics🧪 Practice exercises
If-Else StatementsSwitch StatementsFor & While LoopsBreak, Continue & Loop Control
Start Module
Module 4

Object-Oriented Programming

Learn object-oriented programming with practical examples and exercises.

Intermediate3 hours
▶️ 3 topics🧪 Practice exercises
Classes & ObjectsMethods & ParametersEncapsulation & Access Modifiers
Start Module
Module 5

Classes, Inheritance & Polymorphism

Learn classes, inheritance & polymorphism with practical examples and exercises.

Intermediate3 hours
▶️ 3 topics🧪 Practice exercises
Inheritance BasicsMethod Overriding & PolymorphismAbstract Classes & Interfaces
Start Module
Module 6

Collections Framework

Learn collections framework with practical examples and exercises.

Intermediate2.5 hours
▶️ 3 topics🧪 Practice exercises
ArrayList & Dynamic ArraysHashMap & Key-Value PairsSets, Queues & Iterators
Start Module
Module 7

Exception Handling

Learn exception handling with practical examples and exercises.

Advanced3 hours
▶️ 3 topics🧪 Practice exercises
Try-Catch-Finally BlocksCustom Exceptions & ThrowException Best Practices
Start Module
Module 8

File I/O & Streams

Learn file i/o & streams with practical examples and exercises.

Advanced2.5 hours
▶️ 3 topics🧪 Practice exercises
Reading & Writing FilesJava Streams APISerialization & Data Formats
Start Module
Module 9

Multithreading & Concurrency

Learn multithreading & concurrency with practical examples and exercises.

Advanced2 hours
▶️ 3 topics🧪 Practice exercises
Creating & Running ThreadsSynchronization & Thread SafetyThread Pools & Executors
Start Module
Module 10

Java Project: Banking Application

Build a complete banking application with Java — OOP design, collections, exception handling, file I/O, and a professional console interface.

Advanced5 hours
▶️ 4 topics🧪 Practice exercises🛠️ Mini project
Project Architecture & Account ClassBank Manager & Multiple AccountsFile I/O & Data PersistenceComplete Application & Review
Start Module
Module 11

Spring Framework & Modern Java

Master Spring Boot, JPA, modern Java features, and professional testing.

Advanced5 hours
▶️ 4 topics🧪 Practice exercises🛠️ Mini project
Spring Boot FundamentalsModern Java FeaturesJava Testing & QualityJava Build & DevOps
Start Module
Module 12

Java Career & Enterprise Development

Master Java microservices, performance tuning, interview prep, and career paths.

Advanced5 hours
▶️ 4 topics🧪 Practice exercises
Java MicroservicesJava Performance TuningJava Interview PreparationJava Career Paths
Start Module

Your Learning Roadmap

Follow this structured path - from first concepts to production-ready mastery

Step 01 · Beginner

Modules 1-3: Java fundamentals and basics

Step 02 · Intermediate

Modules 4-7: Advanced concepts and practical applications

Step 03 · Advanced

Modules 8-12: Spring, microservices, and enterprise development

Tools & Technologies

Essential tools you'll master during this course

IntelliJ IDEA

Java IDE

IDE

Maven

Build tool

Build

JUnit

Testing framework

Testing

Ready to Start Learning?

Begin your journey with Module 1 and build your skills step by step. Completely free, no registration required.

Start Learning Now

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