Object-Oriented Programming OOP

title: OOPs Introduction description: Object Oriented Programming ka introduction

OOP ek programming paradigm hai jo real-world entities ko classes aur objects ke roop mein model karta hai.

OOP kya hai?

Real duniya ki cheezein — Car, Student, Bank Account — inhe Java mein class aur object ke roop mein represent karte hain.

OOP ke 4 Pillars

1. Encapsulation

Data aur methods ko ek unit (class) mein band karna. Data private, access getters/setters se.

2. Inheritance

Ek class doosri class ki properties aur methods inherit karti hai. Code reuse hota hai.

3. Polymorphism

Same method ka alag-alag behavior. Overloading (compile-time) aur Overriding (runtime).

4. Abstraction

Implementation hide karna, sirf functionality dikhana. Abstract class aur Interface se.

Procedural vs OOP

OOP ke Fayde

• Code reusability (Inheritance)
• Security (Encapsulation)
• Flexibility (Polymorphism)
• Easy maintenance
• Real-world modeling

Java mein OOP

• Sab kuch class ke andar hota hai
• Object se methods aur variables access karte hain
• main() bhi ek class ka static method hai