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 Filter 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 enables developers to filter a set of objects using different criteria and chaining them in a decoupled way through logical operations.

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 builds a complex object using simple objects and using a step by step approach?

A - Builder Pattern

B - Bridge Pattern

C - Adapter Pattern

D - Filter Pattern

Q 4 - Which of the following describes the Interpreter pattern correctly?

A - In this pattern a class represents functionality of another class.

B - This pattern creates a chain of receiver objects for a request.

C - This pattern provides a way to evaluate language grammar or expression.

D - In this pattern a request is wrapped under an object as command and passed to invoker object.

Q 5 - Which of the following describes the Mediator 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 changes based on its state?

A - State Pattern

B - Null Object Pattern

C - Strategy Pattern

D - Template Pattern

Q 7 - Which of the following describes the Service Locator pattern correctly?

A - This pattern is used to separate low level data accessing API or operations from high level business services.

B - This pattern is used to provide a centralized request handling mechanism so that all requests will be handled by a single handler.

C - This pattern is used when we want to do some pre-processing / post-processing with request or response of the application.

D - This pattern is used when we want to locate various services using JNDI lookup.

Q 8 - Which of the following pattern is used when we want to locate various services using JNDI lookup?

A - DAO Pattern

B - Front Controller Pattern

C - Intercepting Pattern

D - Service Locator Pattern

Q 9 - Which of the following describes the Structural 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 Intercepting pattern?

A - Filter, Filter Chain, Target, Client

B - Filter, Target, Filter Manager, Client

C - Filter, Filter Chain, Target, Filter Manager, Client

D - Filter, Filter Chain, Filter Manager, Client