CMIS 241
Cones, Spheres, Hash

Write a program that maintains a hash set of Cone and Sphere objects.
Name it ConesSpheresHash.
Its GUI looks the posted image: conessphereshash.png.
Base your program on the ConeTest.java for its GUI and the
DatesHashTest.java for the hash set.


Cone and Sphere classes must override Object's equals and hashcode methods.
Base this on the code in the Date.java that overrides equals and hashcode.
Two cones are equal if their radiuses and heights are equal.
Two spheres are equal if their radiuses are equal.
Use (10*radius+10*height)%101 as the hashcode value.
Use the posted Cone.java program and add the overriding hashCode method.
Sphere class needs equals and hashCode.

A sphere has a radius only (no height). 
Its area is 4 pi (radius squared)
Its volume is four-thirds pi (radius cubed)

Pressing Add adds a Cone or Sphere (depending on which radio button is
selected) of indicated radius (and height, if a cone) to the hash set.
Pressing Remove removes the Cone or Sphere of specified size from the
hash set.

Attempting to add a cone or sphere already in the hash set results in
an error JOptionPane message.
Attempting to remove a cone or sphere not in the hash set results in
an error JOptionPane message.
Successful removal of an object will cause it to disappear from the
textarea (hint: after removing it from the hash set, clear the
textarea, then iterate over the hash set to display its current set of
objects).  The textarea always shows the current contents of the hash
set.


Submit ConesSpheresHash.java, Cone.java, and Sphere.java as one zipped
file.