Abstract Oops

 What is Abstract on OOPS ?
Ans: Java mein abstract class ka use karke aap ek class ko define kar sakte hain jiska object directly create nahi kiya ja sakta, lekin jise aap dusre classes ke liye blueprint ke roop mein istemal kar sakte hain. Yeh abstract classes inheritance ke through ek hierarchy ko define karne mein bhi madad karte hain. Niche ek simple example diya gaya hai:

// Abstract class
abstract class Shape {
    // Abstract method
    abstract void draw();

    // Non-abstract method
    void display() {
        System.out.println("This is a shape.");
    }
}

// Concrete class extending abstract class
class Circle extends Shape {
    // Implementing abstract method
    void draw() {
        System.out.println("Drawing a circle");
    }
}

// Concrete class extending abstract class
class Rectangle extends Shape {
    // Implementing abstract method
    void draw() {
        System.out.println("Drawing a rectangle");
    }
}

public class Main {
    public static void main(String[] args) {
        Shape circle = new Circle();
        circle.draw();    // Output: Drawing a circle
        circle.display(); // Output: This is a shape.

        Shape rectangle = new Rectangle();
        rectangle.draw();    // Output: Drawing a rectangle
        rectangle.display(); // Output: This is a shape.
    }
}