Design Patterns Online Quiz

Q 1 - Which of the following is true about design patterns?

A - Design patterns represent the best practices used by experienced object-oriented software developers.

B - Design patterns are solutions to general problems that software developers faced during software development.

C - Design patterns are obtained by trial and error by numerous software developers over quite a substantial period of time.

D - All of the above.

Q 2 - Which of the following describes the Bridge pattern correctly?

A - This pattern builds a complex object using simple objects and using a step by step approach.

B - This pattern refers to creating duplicate object while keeping performance in mind.

C - This pattern is used when creation of object directly is costly.

D - This pattern is used when we need to decouple an abstraction from its implementation so that the two can vary independently.

Q 3 - Which of the following pattern is used when creation of object directly is costly?

A - Bridge Pattern

B - Adapter Pattern

C - Prototype Pattern

D - Filter Pattern

Q 4 - In which of the following pattern a class represents functionality of another class?

A - Proxy Pattern

B - Chain of Responsibility Pattern

C - Command Pattern

D - Interpreter Pattern

Q 5 - Which of the following describes the Memento pattern correctly?

A - This pattern is used to get a way to access the elements of a collection object in sequential manner without any need to know its underlying representation.

B - This pattern is used to reduce communication complexity between multiple objects or classes.

C - This pattern is used to restore state of an object to a previous state.

D - This pattern is used when there is one-to-many relationship between objects such as if one object is modified, its depenedent objects are to be notified automatically.

Q 6 - In which of the following pattern, a class behavior or its algorithm can be changed at run time?

A - State Pattern

B - Null Object Pattern

C - Strategy Pattern

D - Template Pattern

Q 7 - Which of the following pattern is used to separate low level data accessing API or operations from high level business services?

A - DAO Pattern

B - Front Controller Pattern

C - Intercepting Pattern

D - Service Locator Pattern

Q 8 - Which of the following pattern involves a single class which is responsible to create an object while making sure that only single object gets created?

A - Factory Pattern

B - Abstract Factory Pattern

C - Singleton Pattern

D - Transfer Object Pattern

Q 9 - Which of the following describes the Behavioral pattern correctly?

A - This type of patterns provide a way to create objects while hiding the creation logic, rather than instantiating objects directly using new opreator

B - This type of patterns concern class and object composition. Concept of inheritance is used to compose interfaces and define ways to compose objects to obtain new functionalities.

C - This type of pattern are specifically concerned with communication between objects.

D - This type of pattern are specifically concerned with the presentation tier.

Q 10 - Which of the following is the correct list of entities of Transfer Object pattern?

A - Business Object , Transfer Object, Client

B - Service, Context, Service Locator, Cache, Client

C - Business Object , Client

D - Service, Service Locator, Client