Design Patterns Online Quiz

Q 1 - What is Gang of Four (GOF)?

A - Four authors of Book 'Design Patterns - Elements of Reusable Object-Oriented Software' are known as Gang of Four (GOF).

B - Gang of Four (GOF) is a name of a book on Design Patterns.

C - Gang of Four (GOF) is a Design Pattern.

D - None of the above.

Q 2 - Which of the following describes the Adapter 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 works as a bridge between two incompatible interfaces.

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 where we need to treat a group of objects in similar way as a single object?

A - Composite Pattern

B - Facade Pattern

C - Flyweight Pattern

D - Decorator Pattern

Q 4 - Which of the following pattern allows a user to add new functionality to an existing object without altering its structure?

A - Composite Pattern

B - Facade Pattern

C - Flyweight Pattern

D - Decorator Pattern

Q 5 - Which of the following 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?

A - Iterator Pattern

B - Mediator Pattern

C - Memento Pattern

D - Observer Pattern

Q 6 - Which of the following describes the Visitor pattern correctly?

A - In this pattern, a visitor class is used which changes the executing algorithm of an element class.

B - This pattern is used to separate application's concerns.

C - This pattern is used to decouple presentation tier and business tier.

D - This pattern is used in EJB persistence mechanism.

Q 7 - Which of the following describes the Front Controller 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 to provide a centralized request handling mechanism so that all requests will be handled by a single handler?

A - DAO Pattern

B - Front Controller Pattern

C - Intercepting Pattern

D - Service Locator Pattern

Q 9 - Which of the following describes the J2EE 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