QUESTION $1[15$ points$]$

Table $1$ shows the difference between decorator pattern and Inheritance. Please write which

label $($Decorator$,$Inheritance$)$ the columns belong to$.$

Table $1$

Used to extend the functionality of a particular object. Used to extend the functionality of a class of

objects.

Does not require subclassing. Requires subclassing.

Dynamic. Static.

Runtime assignment of responsibilities. Compile time assignment of responsibilities.

Prevents the proliferation of subclasses leading to less

complexity and confusion.

Could lead to numerous subclasses, exploding

class hierarchy on specific occasions.

More flexible. Less flexible.

Possible to have different decorator objects for a given

object simultaneously. A client can choose what

capabilities it wants by sending messages to an

appropriate decorator.

Having subclasses for all possible combinations of

additional capabilities, which clients expect out of

a given class, could lead to a proliferation of

subclasses.

Easy to add any combination of capabilities. The same

capability can even be added twice. Difficult.