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Description

In this lab, you will be implementing the following class hierarchy. Your concrete classes must call the superclass constructor with the proper number of sides (which is constant for each concrete shape).

The perimeter method is implemented in the superclass as it does not change based on the number of sides. The area method must be overridden in each subclass as the area is dependent on the type of polygon. The areas of an equilateral triangle, square, and a regular

hexagon given side length a are

3 2, 2, and

4

33

2

2.

The superclass area method should just return 0 as a default value. This is called kludge”. Later, we will learn about abstract classes to deal with cases like this.

I have provided an empty template for a Regular Polygon, Triangle, Square, and Hexagon. You must fill in all the correct methods and make sure each subclass extends RegularPolygon. I

have also provided a driver that you may use to test your code. Take note of what is happening when I am filling the array containing RegularyPolygons and what happens when I print out the array. Output is on the next page. When complete show your TA.

RegularPolygon

– numSides: int

– sideLength: int

+ RegularPolygon(numSides: int, sideLength: int)

+ getNumSidos(): int

+ getSideLength(): int

+ perimeter(): double

+ area* double

Mangle Square Hexagon

+ Triangle(sideLength: int)

+ area°, double

+ Square(sideLength: int)

+ area(): double

+ Rexagor(sideLength: int)

+ area(): double

Simple way to create objects, as you’ve seen before. Area of each object is:

 Triangle area: 6.9282 Square area: 9 Hexagon area: 10.3923

An array containing triangles, squares, and hexagons has been created. How can this be? Polymorphism. Output is below:

Class: Triangle

Number of sides: 3

Side length: 3

Area: 3.8971

Class: Square

Number of sides: 4

Side length: 4

Area: 16.0000

Class: Hexagon

Number of sides: 6

Side length: 5

Area: 64.9519

Class: Triangle

Number of sides: 3

Side length: 6

Area: 15.5885

Class: Square

Number of sides: 4

Side length: 7

Area: 49.0000

Class: Hexagon

Number of sides: 6

Side length: 8

Area: 166.2769

Class: Triangle

Number of sides: 3

Side length: 9

Area: 35.0740

Class: Square

Number of sides: 4

Side length: 10

Area: 100.0000

Class: Hexagon

Number of sides: 6

Side length: 11

Area: 314.3672