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 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 describes the Facade pattern correctly?

A - This pattern allows a user to add new functionality to an existing object without altering its structure.

B - This pattern is used where we need to treat a group of objects in similar way as a single object.

C - This pattern hides the complexities of the system and provides an interface to the client using which the client can access the system.

D - This pattern is primarily used to reduce the number of objects created and to decrease memory footprint and increase performance.

Q 4 - Which of the following pattern provides a way to evaluate language grammar or expression?

A - Proxy Pattern

B - Chain of Responsibility Pattern

C - Command Pattern

D - Interpreter 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 Null Object pattern correctly?

A - In this pattern, a class behavior changes based on its state.

B - In this pattern, a null object replaces check of NULL object instance.

C - In this pattern, a class behavior or its algorithm can be changed at run time.

D - In this pattern, an abstract class exposes defined way(s)/template(s) to execute its methods.

Q 7 - Which of the following describes the DAO 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 type of design patterns concern class and object composition?

A - Creational Design Patterns

B - Structural Design Patterns

C - Behavioral Design Pattern

D - J2EE Design Patterns

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

A - Data Access Object Interface, Data Access Object concrete class, Model Object or Value Object

B - Data Access Object Interface, Model Object or Value Object

C - Data Access Object Interface, Data Access Object concrete class

D - Data Access Object concrete class, Model Object or Value Object