Java lab 1 (16/10/2023)

abstract class Shape {
    abstract void areaOfRect(int x, int y);
    abstract void areaOfCircle(double r);
    abstract void areaOfSquare(int x);
}

class Rectangle extends Shape {

    void areaOfRect(int x, int y) {
        System.out.println("Area of Rectangle: " + (x * y));
    }
    void areaOfCircle(double r){}

    void areaOfSquare(int x) {}
}
class Circle extends Shape {

    void areaOfRect(int x, int y){}

    void areaOfCircle(double r) {
        System.out.println("Area of Circle: " + (Math.PI * r * r));
    }

    void areaOfSquare(int x) {}
}

// Concrete class Square extending Shape
class Square extends Shape {

    void areaOfRect(int x, int y) {}

    void areaOfCircle(double r) {}

    void areaOfSquare(int x) {
        System.out.println("Area of Square: " + (x * x));
    }
}
public class ShapeDemo {
    public static void main(String[] args) {
        Rectangle rectangle = new Rectangle();
        Circle circle = new Circle();
        Square square = new Square();
        rectangle.areaOfRect(5, 10);
        circle.areaOfCircle(3.5);
        square.areaOfSquare(4);
    }
}