U9 Inheritance Extra • 157 words

Shapes calculator

Use inheritance to store various shapes and do calculations on them depending on the type.

abstract class Shape {
    abstract double getArea();
    abstract double getPerimeter();
}

class Circle extends Shape {
    double radius;
    Circle(double radius) {
        this.radius = radius;
    }
    double getArea() {
        return Math.PI * Math.pow(radius, 2);
    }
    double getPerimeter() {
        return 2 * Math.PI * radius;
    }
}

class Rectangle extends Shape {
    double length, width;
    Rectangle(double length, double width) {
        this.length = length;
        this.width = width;
    }
    double getArea() {
        return length * width;
    }
    double getPerimeter() {
        return 2 * (length + width);
    }
}

public class Main {
    public static void main(String[] args) {
        Circle circle = new Circle(5);
        System.out.println("Circle Area: " + circle.getArea());
        System.out.println("Circle Perimeter: " + circle.getPerimeter());

        Rectangle rectangle = new Rectangle(4, 5);
        System.out.println("Rectangle Area: " + rectangle.getArea());
        System.out.println("Rectangle Perimeter: " + rectangle.getPerimeter());
    }
}

Main.main(null);

Circle Area: 78.53981633974483
Circle Perimeter: 31.41592653589793
Rectangle Area: 20.0
Rectangle Perimeter: 18.0