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Free Certificate
Java Object-oriented Programming
Master the core Java object oriented principles in this free course—learn classes, objects, inheritance, polymorphism, encapsulation, and abstraction with practical programming examples.
12 hours of learning
Abstraction
Datatypes
Inheritance
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Key Highlights Of This Free Java Object-Oriented Principles Course
What You Will Learn
Abstraction
Master the foundational principle of abstraction in Java OOP, where you learn to model real-world entities into classes and objects, while hiding unnecessary details and focusing on essential behavior. This principle allows you to build modular and maintainable code from the ground up.
Topics Covered
- Classes
Understand how to define classes as blueprints for creating objects. You'll explore the structure of a class in Java, including fields, constructors, and methods. This sets the stage for applying OOP in building scalable applications by organizing data and behavior in a logical format. - Objects
Learn how to create and use objects that are instances of classes. You'll practice initializing objects and invoking methods to simulate real-world interactions, which helps reinforce the core idea of encapsulating state and behavior. - Multiple Objects in a Class
Dive deeper into object manipulation by creating multiple instances from the same class. This section highlights how objects maintain individual data states, enabling you to simulate real-world systems with multiple entities that interact independently within a program.
- Constructors
Explore how constructors are used to initialize objects when they are created. You’ll learn about default, parameterized, and overloaded constructors, and how to use them efficiently to assign initial values and streamline object creation in Java.
Encapsulation
Gain hands-on knowledge of encapsulation, the OOP principle that promotes data hiding and controlled access. You'll learn to secure internal object states by restricting direct access using access modifiers and controlled data exposure through public methods.
Topics Covered
- Private Access Modifier
Discover how the private keyword protects internal class members from outside interference. This ensures that only the class itself can modify its fields, enhancing security, robustness, and adherence to clean code principles. - Getter Methods
Learn how getter methods expose private variables in a read-only manner. You’ll implement controlled data access mechanisms that help external classes retrieve object information without compromising encapsulation. - Setter Methods
Explore how setter methods allow you to modify object data securely. You’ll use validation checks within setters to ensure that only valid data enters your objects, reinforcing object integrity and stability. - Constructors and Setter Methods
Understand the differences and complementary roles of constructors and setter methods in object initialization and modification. You’ll build examples demonstrating scenarios where using both is beneficial for code clarity and flexibility.
- Private Methods
Learn to encapsulate logic further with private methods—these are utility functions that serve internal class operations. You’ll understand their purpose in maintaining internal consistency and reducing unnecessary exposure of implementation details.
Inheritance
Explore inheritance—the OOP mechanism that allows classes to inherit properties and behaviors from other classes. You'll learn how this promotes code reuse, simplifies maintenance, and models real-world hierarchical relationships effectively.
Topics Covered
- What is Inheritance?
Grasp the basic concept of inheritance in object-oriented design, where child classes derive functionalities from parent classes. This enables cleaner code architecture and eliminates redundancy by reusing logic across multiple classes. - Inheritance in Java
Learn how inheritance is implemented in Java using the extends keyword. You’ll practice building base and derived classes, observing how methods and fields are inherited and customized. - Inheriting from Subclasses
Understand how child classes can not only inherit from parents but also add or override behaviors. This subtopic focuses on real-world examples where extended functionality is essential without rewriting parent code. - Protected Access Modifier
Explore the protected keyword, which allows subclass access while keeping variables hidden from the outside world. You’ll see how it plays a crucial role in inheritance hierarchies to maintain encapsulation.
- Inheritance vs. Composition
Examine the trade-offs between inheritance and composition. You’ll understand when to favor inheritance for hierarchical models and when to use composition for greater flexibility and reduced coupling.
Polymorphism
Master polymorphism—an advanced OOP concept that allows one interface to serve multiple implementations. You’ll learn how polymorphism enables flexibility, extensibility, and simplified code evolution in Java.
Topics Covered
- Method Overriding
Learn how subclasses redefine parent class methods to provide specific behavior. This reinforces the principle of dynamic behavior and makes code more adaptable to future changes. - Method Overloading
Explore method overloading to use the same method name with different argument types or counts. This promotes code clarity and reduces redundancy when implementing multiple behaviors with similar logic. - Dynamic Polymorphism
Understand runtime polymorphism, where method calls are resolved dynamically at execution. You'll work with references of the parent class holding child class objects to see how Java determines which method to invoke. - Abstract Classes
Discover how abstract classes allow partial implementation. You'll define common attributes or methods and leave specific behavior for subclasses, promoting a contract-driven design approach. - Interfaces
Dive into interfaces, which define what a class must do but not how. You'll learn to build decoupled systems where classes can implement multiple interfaces to support diverse behaviors.
Free Object-Oriented Programming Certification
Earn and Share Your Certificate
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Receive a signed and verifiable e-certificate from upGrad upon successfully completing the course.
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