K&B LearnKey Exam

[Vyas Sanzgiri]

is-a relationships always rely on inheritance

is-a relationships always require at least two class types

is-a relationships always rely on polymorphism

I do not understand point 2 and 3. Please explain

[Amey Chitre]

Is-A requires two class types - this can be explained on the basis of 1st point Inheritance means class A extends B means Class A IS-A B
Also interfaces are like abstract classes interface A implements B ie it requires atleast two class types two show the IS-A relationship


Use of Inheritance means code reuse or use polymorphism thats why IS-A relys on polymorphism

would really appreciate some more people comment on this


Amey Chitre

[Ankit Garg]

Well Is-A relationship doesn't require two classes always. When you extend an interface from another or implement an interface in a class, then there is none and 1 class involved respectively...

[Vyas Sanzgiri]

Which proves that there are mistakes in the K&B exam. I found at least 3-4 mistakes per exam. Please be careful while reviewing.

Another disaster is in the MusicPlayer class the jar given in the question is mp.jar but the answers have cp.jar as the correct answer!!