JAVA Foundation Course | Chapter 4: Object-Oriented Programming (OOP) in Java by Prakhar Chauhan | Learn Smarter
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Chapter 4: Object-Oriented Programming (OOP) in Java

Object-oriented programming in Java is centered around the use of classes and objects, which serve as blueprints for creating real-world entities. Core principles like encapsulation, abstraction, inheritance, and polymorphism allow for efficient structure, modularity, and code reuse. Concepts such as constructors and access modifiers play vital roles in initializing and securing data.

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Sections

  • 4

    Object-Oriented Programming (Oop) In Java

    This section introduces Object-Oriented Programming (OOP) in Java, covering its key principles, classes, objects, and their dynamics.

    Learning Practice

  • 4.1

    What Is Object-Oriented Programming?

    Object-Oriented Programming (OOP) in Java utilizes objects and classes, focusing on principles that enhance code organization.

    Learning Practice

  • 4.2

    Classes And Objects

    This section introduces classes and objects in Java, explaining their roles as blueprints and instances, respectively.

    Learning Practice

  • 4.2.1

    What Is A Class?

    A class is a blueprint for creating objects, defining their properties and behaviors.

    Learning Practice

  • 4.2.2

    What Is An Object?

    An object in Java represents a real-world entity created from a class, holding actual values and behaviors.

    Learning Practice

  • 4.3

    Constructors

    Constructors are special methods in Java that initialize new objects when their class is instantiated.

    Learning Practice

  • 4.3.1

    Default Constructor

    A default constructor is a special method used to initialize objects without parameters.

    Learning Practice

  • 4.3.2

    Parameterized Constructor

    A parameterized constructor allows initialization of objects with specific values during their creation.

    Learning Practice

  • 4.3.3

    Constructor Overloading

    Constructor Overloading allows a class to have multiple constructors with different parameter lists, enabling flexible object initialization.

    Learning Practice

  • 4.4

    Encapsulation

    Encapsulation in Java is the practice of wrapping data and methods that operate on that data within a single unit, restricting access to the data.

    Learning Practice

  • 4.5

    Abstraction

    Abstraction in Java is the concept of hiding complex implementation details and exposing only essential features of an object.

    Learning Practice

  • 4.6

    Inheritance

    Inheritance allows classes to inherit features from other classes, promoting code reuse.

    Learning Practice

  • 4.7

    Polymorphism

    Polymorphism in Java allows methods to do different things based on the object that is calling them.

    Learning Practice

  • 4.7.1

    Method Overloading (Compile-Time)

    Method overloading in Java allows a class to define multiple methods with the same name but different parameters.

    Learning Practice

  • 4.7.2

    Method Overriding (Run-Time)

    Method overriding in Java allows a subclass to provide a specific implementation of a method that is already defined in its superclass.

    Learning Practice

  • 4.8

    The This Keyword

    The 'this' keyword in Java refers to the current object, primarily used to differentiate between instance variables and parameters.

    Learning Practice

  • 4.9

    The Static Keyword

    The `static` keyword in Java defines class-level members that are shared among all instances of a class.

    Learning Practice

  • 4.10

    Access Modifiers

    Access modifiers in Java specify the visibility of classes, methods, and variables.

    Learning Practice

  • 4.11

    Real-World Analogy: Oop Concepts

    This section uses real-world analogies to simplify key Object-Oriented Programming (OOP) concepts in Java.

    Learning Practice

  • 4.12

    Chapter Summary

    This section encapsulates the key concepts of Object-Oriented Programming (OOP) in Java, summarizing the core principles and features.

    Learning Practice

References

Untitled document (17).pdf

Class Notes

Memorization

What we have learnt

  • Classes and objects are cor...
  • Use constructors to initial...
  • Encapsulation protects data...

Final Test

Revision Tests