# L07 - Shapes Lab

In this lab, we'll work with Abstract Classes.
1.	Start VS Code. 
2.	During the lecture we discussed the following classes: 
    - `Shape` – an abstract class 
    - `Circle` – a class that is derived from Shape 
    - `Ellipse` – a class that is also derived from Shape 
3.	Using the `Circle` class a guide and the Ellipse slide, finish writing the `Ellipse` class 
4.	Using the `Circle` class as a guide, write a class called `Rectangle`: 
    - extend the `Shape` class 
    - define member variables of type `double` for the `width` and `height` 
    - create one or more constructors, as appropriate 
    - override the `equals`, `toString`, `findArea`, and `findPerimeter` methods 
5.	Create a new class with the name `ShapeTest`. 
6.	This is the body of the class `ShapeTest`:
```
public class ShapeTest {
    public static void main(String[] args) {
        Shape[] myShapes = new Shape[10]; 
        Circle myCircle = new Circle(10.0); 
        double expected = 314.16; 
        System.out.println("Circle Area: " + myCircle.findArea());

        myShapes[0] = new Circle(10.0); 
        expected = 314.16; 
        System.out.println("Circle in Shapes Array Area: " + myShapes[0].findArea());

        myShapes[1] = new Ellipse(5.0, 10.0);
        expected = 157.08;
        System.out.println("Ellipse in Shapes Array Area: " + myShapes[1].findArea());

        myShapes[2] = new Rectangle(5.0, 10.0); 
        expected = 50.0; 
        System.out.println("Rectangle in Shapes Array Area: " + myShapes[2].findArea());
    } 
}
```
When you run the tests, notice that Java knows what particular kind of object (`Circle`, `Rectangle`, or `Ellipse`) has been stored in the array of `Shapes`.