Introduction to Object-Oriented Programming in Java
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Learn to build Java classes and objects, then apply encapsulation, inheritance, interfaces and polymorphism through short interactive exercises.
Object-oriented programming in Java organizes code around classes that serve as blueprints for objects, each carrying its own fields and methods. It helps remove duplicated code and control what other parts of a program can see. You define a car class, give it a constructor and behavior, restrict access to its members, and extend it through inheritance, abstract classes and interfaces, then adapt its methods by overriding and overloading them.
What You Will Achieve
- Define a Java class with fields and create object instances from it
- Write constructors with parameters and add void and return-type methods to a class
- Use access modifiers and private members to control what other code can reach
- Extend a base class, implement abstract methods and interfaces, and override or overload methods
Program Overview
Classes, Objects, and Constructors
Sets out how objects differ from primitive data types and how a class defines the fields, constructors and methods its objects share.
- Primitive data types versus objects
- Defining classes and creating instances
- Properties and constructor parameters
- Void methods and methods with return types
Encapsulation, Inheritance, and Abstraction
Controls access to class members and reuses code by extending classes and defining abstract ones that subclasses must complete.
- Access modifiers, public fields and private members
- A static formula class
- Centralizing code with inheritance
- Abstract classes and abstract methods
Interfaces and Polymorphism
Adds shared behavior through interfaces and makes code more adaptable with method overriding and several forms of one method.
- Defining and implementing interfaces
- Method overriding in subclasses
- Method overloading
- Constructor overloading
Certificate Awarded (Paid)
Job Outlook
These skills apply wherever Java code is written and maintained, including software teams that structure their programs around classes, inheritance and interfaces to keep code reusable.
Good for: Learners already writing Java who want to organize their programs around classes, inheritance and interfaces through short, guided exercises.
Keep in mind: The exercises keep returning to one car class and its subclasses, so applying these patterns to a larger program of your own takes extra practice.
Bottom line: A compact walk through Java’s core object-oriented features, built on one example that grows a chapter at a time.
Frequently Asked Questions
What example do the exercises build on?
Most exercises work on a car class: you define it, add properties and a constructor, give it methods, make it abstract and extend it. A Tesla class later implements an interface, and a separate static formula class appears in the encapsulation lessons.
How does overriding differ from overloading in the lessons?
In the final chapter, overriding lets a subclass customize behavior it inherits, while overloading defines several forms of one method inside the same class. Constructors are overloaded too, so objects can be created in more than one way.
Where do abstract classes come in?
Abstract classes come in the second chapter, after inheritance: the car class is made abstract and subclasses implement its abstract methods, so every version follows the same contract. Interfaces follow in the third chapter as another way to share behavior across classes.
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