Introduction to OOP's

Introduction to OOPs (Object-Oriented Programming)

In today’s digital world, computer programming plays a very important role. To develop efficient, reusable, and secure software, programmers follow a modern approach called Object-Oriented Programming (OOPs).

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What is OOPs?

OOPs (Object-Oriented Programming System) is a programming approach in which programs are designed using objects and classes instead of only logic and functions.

OOPs is a programming method that organizes software design around objects rather than functions.

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Why Do We Need OOPs?

• Makes programs easy to understand
• Improves code reusability
• Enhances data security
• Reduces errors
• Easy maintenance of large programs

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Real-Life Example of OOPs

Consider a Student:

Real World	OOP Concept
Student	Object
Name, Roll No, Marks	Data Members
Study(), WriteExam()	Methods

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Basic Concepts of OOPs

OOPs is based on four main pillars which are very important for ICSE exams.

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1. Class

A class is a blueprint or template used to create objects.

class Student {
    int rollNo;
    String name;

    void display() {
        System.out.println(rollNo + " " + name);
    }
}

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2. Object

An object is an instance of a class and represents a real-world entity.

class Main {
    public static void main(String args[]) {
        Student s1 = new Student();
        s1.rollNo = 1;
        s1.name = "Aman";
        s1.display();
    }
}

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3. Encapsulation

Encapsulation means binding data and methods together and protecting data from unauthorized access.

class Account {
    private int balance = 5000;

    public int getBalance() {
        return balance;
    }
}

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4. Abstraction

Abstraction means showing only essential information and hiding implementation details.

abstract class Shape {
    abstract void draw();
}

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5. Inheritance

Inheritance allows one class to acquire the properties of another class.

class Animal {
    void eat() {
        System.out.println("Eating...");
    }
}

class Dog extends Animal {
    void bark() {
        System.out.println("Barking...");
    }
}

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6. Polymorphism

Polymorphism means one name, many forms.

class MathOperation {
    int add(int a, int b) {
        return a + b;
    }

    int add(int a, int b, int c) {
        return a + b + c;
    }
}

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Advantages of OOPs

• Easy to understand and modify
• Secure programming
• Supports large applications
• Reusable code
• Better productivity

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Important Exam-Oriented Points

• Class is a blueprint
• Object is an instance of a class
• Encapsulation means data hiding
• Inheritance supports reusability
• Polymorphism means one name, many forms
• Abstraction hides implementation details

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