Java OOP: Object Oriented Programming with Exercises – 2026

Looking to master the foundations of modern software development? The Java OOP: Object Oriented Programming with Exercises – 2026 course, led by expert instructor Andrii Partola, is a comprehensive training program designed to take you from basic syntax to advanced architectural patterns. Whether you are searching for a free Java OOP course, a high-quality Java OOP Udemy course, or the best way to learn Java online, this updated July 2026 curriculum provides the practical skills needed to write professional, scalable code. This course is available on Udemy and focuses on transforming theoretical knowledge into real-world programming expertise through rigorous exercises and industry-standard practices.

What You'll Learn

• Master the core pillars of Object Oriented Programming (OOP) to create more efficient and maintainable Java applications.
• Build complex class hierarchies and objects from scratch using industry-standard naming conventions and structures.
• Implement strict encapsulation using private fields, getters, and setters to protect data integrity within your programs.
• Apply inheritance techniques to reuse code and create specialized classes that extend existing functionality.
• Create flexible software systems by utilizing polymorphism, allowing one interface to represent different underlying forms.
• Analyze the difference between method overloading and method overriding to optimize how your Java methods behave.
• Understand the strategic use of abstract classes and interfaces to define blueprints for complex system architectures.
• Implement SOLID principles to ensure your code is robust, scalable, and easy to refactor as project requirements change.

Course Details

• Instructor: Andrii Partola
• Rating: 4.4 stars
• Level: Intermediate
• Language: English
• Certificate: Yes, upon completion
• Includes: Lifetime access, mobile-friendly content, and GitHub code repository access

What This Course Covers

Foundation of Object Oriented Programming

• Transitioning from procedural programming to the object-oriented paradigm in Java
• Defining classes as blueprints for creating real-world objects
• Mastering object instantiation and memory allocation in the Java Virtual Machine
• Designing constructors to initialize object state effectively upon creation

Encapsulation and Data Hiding

• Understanding the concept of data hiding to prevent unauthorized state modification
• Implementing access modifiers (private, protected, public) to control visibility
• Creating standardized getter and setter methods for controlled data access
• Applying validation logic within setters to ensure object consistency

Inheritance and Class Hierarchies

• Building "is-a" relationships between parent (super) and child (sub) classes
• Utilizing the extends keyword to inherit attributes and methods
• Mastering the super keyword to call parent class constructors and methods
• Implementing method overriding to provide specific behavior in derived classes

Polymorphism and Dynamic Binding

• Understanding the core concept of polymorphism in Java development
• Differentiating between compile-time polymorphism (overloading) and runtime polymorphism (overriding)
• Creating flexible methods that can operate on various object types via a common superclass
• Applying upcasting and downcasting techniques safely within a Java environment

Abstraction through Interfaces and Abstract Classes

• Designing abstract classes to represent generic concepts that cannot be instantiated
• Implementing interfaces to define a strict contract for what a class must do
• Comparing and contrasting when to use an abstract class versus an interface
• Building decoupled systems that rely on abstractions rather than concrete implementations

Software Architecture and SOLID Principles

• Applying the Single Responsibility Principle to keep classes focused and lean
• Implementing the Open/Closed Principle to allow for extension without modifying existing code
• Understanding the Liskov Substitution Principle for reliable inheritance hierarchies
• Utilizing the Interface Segregation and Dependency Inversion principles for modular design

Who Should Take This Course

• Beginner Java Developers who understand basic syntax (loops, variables) but struggle with how to structure a full application.
• Computer Science Students seeking a practical, exercise-driven supplement to their academic studies in OOP.
• Aspiring Software Engineers preparing for technical interviews that heavily test Java core and object-oriented design patterns.
• Professionals Transitioning to Java from other languages who need to understand the specific way Java handles classes and interfaces.
• Intermediate Coders who want to move beyond "working code" to "clean code" by mastering SOLID principles.

Prerequisites

• Basic Java Knowledge: You should be familiar with Java fundamentals, including variables, primitive data types, loops (for, while), and basic conditional statements (if/else).
• Development Environment: A basic understanding of how to run a Java program in an IDE (such as IntelliJ IDEA, Eclipse, or VS Code) is recommended.
• No Prior OOP Experience Needed: This course starts from the ground up regarding object-oriented concepts, making it perfect for those new to the paradigm.

Why Enroll in This Course

This course stands out because it is taught by Andrii Partola, a Senior Java Engineer who applies these exact concepts in professional enterprise environments every day. Rather than focusing solely on theory, the curriculum emphasizes "learning by doing" through extensive coding exercises and real-world examples. For those looking to upgrade their skills without a financial burden, the availability of a free coupon for a limited time makes this an incredible opportunity to get 100% off a professional-grade education. Enrolling now ensures you gain access to a structured path toward becoming a proficient Java developer before the offer expires.

Course Highlights

• Industry-Expert Instruction: Learn from a Senior Java Engineer who bridges the gap between academic theory and professional practice.
• Practical Coding Exercises: Move beyond watching videos by solving actual programming challenges that simulate real-world tasks.
• Knowledge Validation: Integrated quizzes after key lessons ensure you have mastered a concept before moving to the next module.
• Open Source Integration: Full access to all course code via GitHub, allowing for easy review, debugging, and future reference.
• Structured Learning Path: A carefully organized step-by-step curriculum designed to prevent cognitive overload and ensure steady progress.
• Flexible Learning: Lifetime access to materials allows you to learn at your own pace on any device.

Frequently Asked Questions

Q: Is this course really free? A: Yes, the course is available for free when you use a valid limited-time coupon. Once you enroll using the 100% off coupon, you gain full access to the materials and the certificate of completion.

Q: What will I learn in this Java OOP course? A: You will master the four pillars of OOP: Encapsulation, Inheritance, Polymorphism, and Abstraction. Additionally, the course covers practical implementation through exercises and introduces the SOLID principles used by professional software architects.

Q: Do I get a certificate after completing this course? A: Yes, upon successfully completing all the video lessons and requirements, you will receive a certificate of completion from Udemy. This can be added to your LinkedIn profile or resume to showcase your Java skills.

Q: Is this course suitable for absolute beginners? A: This course is designed for those who have a basic grasp of Java syntax (like variables and loops). If you have never written a line of code before, it is recommended to take a "Java for Beginners" crash course first.

Q: How long do I have to enroll for free? A: Free coupons are typically available for a limited time or for a specific number of redemptions. It is highly recommended to enroll as soon as possible to secure your lifetime access before the coupon expires.

Final Thoughts

The Java OOP: Object Oriented Programming with Exercises – 2026 course is an essential resource for anyone serious about a career in software development. By combining the expertise of Andrii Partola with a hands-on, exercise-heavy approach, it ensures that students don't just understand the theory of Java but can actually write clean, professional code. If you are ready to move from basic scripting to professional software engineering, this is the perfect place to start your learning journey.