Exercises using JUnit

1. Design and implement MoneyTest and Money. Use the test-first approach, as we discussed, and document each method before implementing.

   Money

   - dollars : int - cents : int

   + Money (int, int) + getDollars() + getCents() + add (Money) : Money + subtract (Money) : Money + toString() : String + equals (Money) : boolean + compareTo (Money) : int

   • You may assume for now that negative money amounts are allowed.
   • You may assume different attributes (e.g. internally, you may just keep track of total cents), as long as the methods behave as specified. Here is a partial solution based on our demo and discussion in class: MoneyTest.java and Money.java; missing are: second test for testComplexAdd (see bottom of MoneyTest.java), tests and implementations of subtract and compareTo.
   • The compareTo method compares two Money objects: the one that invokes the method and the one received as parameter, and returns
     • 0 if the two Money amounts are the same,
     • -1 if this Money object represents an amount less than that received as parameter, or
     • 1 if this Money object represents an amount greater than that received as parameter.