CS 151: Homework 4

1. Write a class that uses the StringTokenizer class to identify 
the parts of a phone number. Assume that the format of the phone 
number is (nnn) nnn-nnnn. Example (860) 222-3344. The class should
have at least three public methods: one returning the area code, 
one returning the exchange and one returning the extension.

2. Write a class called Triangle that can be used to represent a triangle. 
It should include the following methods that return boolean 
values indicating if the particular property holds:
    -  isRight (a right triangle)
    -  isScalene (no two sides are the same length)
    -  isIsosceles (exactly two sides are the same length)
    -  isEquilateral (all three sides are the same length).

Write an application class to test the triangle class.