Command DP

(Adopted from DP: Gang of 4)

Example: User Interface Toolkit (UIT) has widgets that perform actions in response to user input.

Who can provide implementation:

- UIT

- applications using UIT

Thus, we need to issue requests to objects without knowing anything about:

- the operation being requested

- the receiver of the request.

Solution:

turn the request itself into an object:

Avoid hard-coding: