Design Patterns Online Quiz

Q 1 - Which of the following is correct about Behavioral design patterns.

A - These design patterns are specifically concerned with communication between objects.

B - These design patterns provide a way to create objects while hiding the creation logic, rather than instantiating objects directly using new opreator.

C - These design patterns concern class and object composition. Concept of inheritance is used to compose interfaces and define ways to compose objects to obtain new functionalities.

D - None of the above.

Q 2 - Integer.valueOf is an example of Factory pattern.

A - false

B - true

Q 3 - Which of the following describes the Decorator 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 describes the Command 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 Template 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 Composite Entity 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 8 - Which of the following describes the Factory pattern correctly?

A - This pattern creates object without exposing the creation logic to the client and refer to newly created object using a common interface.

B - In this pattern an interface is responsible for creating a factory of related objects without explicitly specifying their classes.

C - This pattern involves a single class which is responsible to create an object while making sure that only single object gets created.

D - This pattern is used when we want to pass data with multiple attributes in one shot from client to server.

Q 9 - Which of the following pattern is used when we want to pass data with multiple attributes in one shot from client to server?

A - Factory Pattern

B - Abstract Factory Pattern

C - Singleton Pattern

D - Transfer Object Pattern

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