Goal:
Exception handling: Converting preconditions to defined behavior.
Take your solution for Assignment 1.
Modify the class LastDiff
so that lastDiff()
handles its precondition in
two of the ways described by Liskov.
Specifically,
in class LastDiffA,
use the approach that defines special
return elements for arguments that do not satisfy the preconditions.
Be sure to document this properly in the Requires and Effects
clauses.
In class LastDiffB,
use an exception handling approach instead.
Again, be sure to document this properly in the Requires and Effects
clauses.
You do not need to provide any user interface,
just the classes LastDiffA and LastDiffB.
Provide a decent set of JUnit tests.