$4\mathrm{.}3$: Sphere

Design and implement a

class called Sphere that contains

instance data that represents the sphere$$s diameter.

Define the Sphere constructor to accept and initialize

the diameter, and include getter and setter methods for

the diameter. Include methods calcVolume and calcSurfaceArea

that calculate and return

the volume and surface area of the sphere. Include a

toString method that returns a one$-$line description of

the sphere of this form:

sphere with diameter X

where X is the object's diameter rounded to $3$ decimal places.

Use the following formulas in your class:

Volume $=4/3$ PI times cube of the radius

Surface Area $=4$ PI times the square of the radius