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 Composite pattern correctly?

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

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 describes the Chain of Responsibility 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 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 pattern is used to to decouple presentation tier and business tier?

A - Visitor Pattern

B - MVC Pattern

C - Business Delegate Pattern

D - Composite Entity Pattern

Q 8 - In which of the following pattern an interface is responsible for creating a factory of related objects without explicitly specifying their classes?

A - Factory Pattern

B - Abstract Factory Pattern

C - Singleton Pattern

D - Transfer Object 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 Composite Entity pattern?

A - Composite Entity, Coarse-Grained Object, Strategies

B - Composite Entity, Dependent Object, Strategies

C - Composite Entity, Coarse-Grained Object, Dependent Object, Strategies

D - Composite Entity, Coarse-Grained Object, Dependent Object