Scenario 

Assume that a printer needs to deal with different situations, e.g., it can be idle waiting for a job, it can be printing a job and not taking any new jobs due to limited memory, it can be out of paper, or ink or it has printed so much that it is overheating and needs a break to cool down.

Problem: This printer supports a number of actions (print/ reset/ getstatus) that all need to behave differently depending on the

situation the printer currently is in. Implementing these actions would lead to huge IF-THEN-ELSE statements.

 

 

Task#5 Select the most appropriate design pattern to use for this problem and Clearly motivate how this pattern addresses the problem.
 

 

Task#6 Explain how this pattern should be implemented and show an appropriate class diagram to illustrate the implementation of your pattern. (No code). Don’t give a generic class diagram for this pattern but make it specific for that design problem.

 

Use the state pattern. Intent: allow an object to alter its behavior when its internal state changes -

 

.The different situations a printer can be implemented by states which avoids huge if then else statements and allows for easily adding new states -

 

Class diagram -

 

 

State Design Pattern

https://sourcemaking.com/design_patterns/state

جزاك الله خيرا وبعد الخير جنات النعيم .. شكرا جزيلا 

استاذ ممكن توضحو شرح design pattren ع اي اساس اخترتو هذا النوع ??