Polymorphism: Shape Drawing System

Learning Objective: Understand how to handle different object types uniformly using polymorphism

Overview

Polymorphism is a key OOP concept that enables different behaviors with the same interface. A parent class type variable can hold child class instances, and appropriate methods are called at runtime.

Specifications

Create abstract parent class Shape:

• abstract method draw() (no implementation)
• abstract method getArea(): returns area (no implementation)

Create child class Circle:

• Extends Shape
• Private field radius
• Constructor accepts radius
• Implement draw(): outputs "Drawing Circle with radius: [radius]"
• Implement getArea(): returns circle area (radius × radius × 3.14)

Create child class Rectangle:

• Extends Shape
• Private fields width and height
• Constructor accepts width and height
• Implement draw(): outputs "Drawing Rectangle [width]x[height]"
• Implement getArea(): returns rectangle area (width × height)

In Main class:

• Create Shape array (Circle(radius: 5), Rectangle(width: 4, height: 6))
• Call draw() for each element
• Output area for each element in format "Area: [area]"

Output Format

Drawing Circle with radius: 5
Area: 78.5
Drawing Rectangle 4x6
Area: 24.0