Question

You are developing an note-taking app, where the users of this app should be able to choose pens to write with, and notebook canvases to write on. Following the object-oriented approach of software development, you have decided to design two classes Pen and Canvas to start with. What kind of association should exist between class Pen and class Canvas (or their objects) given the following set of rules? Rules: • Pens and canvases are generally independent for their usage, such that no pen is strictly bound to write only to a given canvas and no canvas is strictly bound to be written over by a given pen. • Creation or deletion of the objects of Pen class does not affect the objects of the Canvas class, and creation or deletion of the objects of the Canvas class does not affect the objects of the Pen class. Notes

wat is the answer?

Answer 1

Ans: simple association

Because, here pen is not dependent on Canvas so, it is not dependency.

Here pen is not a compulasary part of Canvas.both can exist individually. So,it is not composition.

It is not Inheritance, because pen or canvas is not deriving from anyone.

Both aggregation and association is same.

Here aggregation refers that there must be a associated with each other.

No there can be associated or not .it's not mandatory to have a link.

So, it is simple association.