Agenda to learn OOPS

 Got it 👍 Here are the main points only (no details), well-structured for quick revision:

1. Methods (return type, parameters, overloading)

  • Syntax of methods in Java

  • Return types (void, primitive, object, array)

  • Parameters (with/without, passing by value)

  • Method Overloading

  • Rules for Overloading

  • Static vs Instance methods

2. Object-Oriented Programming (OOPs) Concepts

Classes and Objects

  • Class definition & members

  • Object creation using new

  • Accessing fields & methods

  • Memory allocation

Constructors

  • Default constructor

  • Parameterized constructor

  • Constructor chaining (this(), super())

  • Constructor vs Method

this & super keyword

  • this → current object, variable differentiation, call constructor

  • super → parent object, call constructor, access parent members

Inheritance

  • Code reusability

  • extends keyword

  • Types: Single, Multilevel, Hierarchical

  • Constructors in inheritance

  • Method overriding in inheritance

Polymorphism

  • Compile-time → Method Overloading

  • Runtime → Method Overriding

  • Rules for overriding

  • @Override annotation

  • Dynamic method dispatch

Encapsulation

  • Data hiding

  • Getters & Setters

  • Access modifiers (public, private, protected, default)

  • Real-time examples

Abstraction

  • Abstract class → abstract & concrete methods, cannot instantiate

  • Interface → full abstraction (Java 7), + static & default methods (Java 8+)

  • Multiple inheritance via interfaces

  • Abstract class vs Interface

  • When to use which

👉 Do you want me to now convert each point into practice questions (like “Write a program to demonstrate constructor chaining”)?

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