Computer Science II

PA 02

Fixing your "Simple Class" from PA01

 and using the command line for testing It

Due by Monday, September 10th

[9:00 AM  for code and paperwork]

Tasks

1. Based on the feedback you received on your paperwork for PA01, and based on in class discussions during Session 6 and Session 7, make the appropriate modifications to your BoundedInteger.java class from PA01.  Make sure that all functionality is present and that all "design issues" are corrected.
2. Create a new class called BoundedIntegerCLTest.java.  This class is designed to be a test of the mathematical operators that are part of BoundedInteger and gets its "instructions" from the command line at run time.  Run time arguments are expected to follow these rules:
   • The initial inputs set up the BoundedInteger to be tested.
   • If three ints are provided, then the three parameter constructor for BoundedInteger is to be used.  If only two ints are provided, then the two parameter constructor is to be used.  You should assume that the lower bound comes before the upper bound comes before the desired value.
   • All additional parameters represent the test to be run on the BoundedInteger.  There are four valid flags for tests:
     • -add, which should be immediately followed by a single int - the parameter for the add() method
     • -sub, which should be immediately followed by a single int - the parameter for the subtract() method
     • -inc, which should NOT be followed by an int since increment does not use one.
     • -dec, which should NOT be followed by an int since decrement does not use one
   • If the provided parameters are an illegal combination, an appropriate error message should be generated.

Thus, the following are all legal invocations of this class

• java BoundedIntegerCLTest 10 20 15 -add 2
• java BoundedIntegerCLTest 10 20 -sub 20
• java BoundedIntegerCLTest 10 20 -dec

While the following are not

• java BoundedIntegerCLTest 10 20 10 20 -add 2
• java BoundedIntegerCLTest 10 20 -dec 2
• java BoundedIntegerCLTest 10 20 10 20 -add

There certainly are other cases and you will need to consider which are and are not legal.

Challenge/Bonus

Modify BoundedIntegerCLTest.java so that it can handle multiple commands provided at the command line. 

For example,

• java BoundedIntegerCLTest 10 20  -add 2 -add 3 -sub 4

Would produce a BoundedInteger whose value is 10, then add 2 to get 12, then add 3 to get 15, and then subtract 4 to get 11. 

Once again, if the command is incorrect you should print an error message.

Deliverables

By the due date and time, submit the files

• BoundedInteger.java
• BoundedIntegerCLTest.java

Shortly after this, you will submit paper printouts of your code.

Be sure that your submission follows all homework submission requirements.