$3.$ Defi ne polymorphism. Give one example of a good

use of polymorphism and one example of a bad use of

polymorphism.

$4.$ What is an inheritance confl ict? How does an inheritance confl ict aff ect the design?

$5.$ Why is cancellation of methods a bad thing?

$6.$ Give the guidelines to avoid problems with inheritance confl icts.

$7.$ Why is it important to know which object$-$oriented

programming language is going to be used to implement the system?