Goal:
Object class contracts.
For this assignment, show what happens when
objects with incorrect equals() implementations
are stored in containers.
Two different exercises; do both:
Point class
where equals() is overridden with the standard recipe
and hashCode() is not overridden at all.
Build a (failing) JUnit test with a HashSet<Point>
collection.
The choice of anomaly is up to you. Explain clearly
why the behavior you observe is incorrect.
Point
and ColorPoint classes,
where equals() is overridden with the standard recipe
in both classes - and hence there is necessarily a symmetry problem.
Override hashCode() in the
Point class and simply inherit it in the ColorPoint
class.
Build another (failing) JUnit test case
with a HashSet<Point>
collection.
Again, the choice of anomaly is up to you. Explain clearly
why the behavior you observe is incorrect.