Exercises using JUnit

I encourage you to show me, or your TA, your work if possible before submitting.
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() : int + getCents() : int + 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. First read and understand the given code (let me or your TA know if you have a question), then complete the missing parts: second test for testComplexAdd (see bottom of MoneyTest.java), and tests and implementations of subtract and compareTo methods.
   • 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.
2. Design and implement AccountTest and Account. Use the test-first approach, as we discussed, and document each method before implementing. Also, don't re-invent the wheel, e.g. when you define your deposit method, let it call as a helper method the add method of your Money class. A transfer between accounts is a deposit to one account and a withdrawal to another; make sure your documentation is clear about which account will be deposited and which account will be withdrawn. Also note the number of, and data types of, parameters (in between parentheses in the diagram below).

   Account

   - name : String - id : String - balance : Money

   + Account (String, String, Money) + deposit (Money) + withdraw (Money) + transfer (Account, Money) + toString() : String + equals (Account) : boolean