Design Patterns Online Quiz

Q 1 - Which of the following is correct about Creational 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 - If we serialize a singleton object and deserialize it then the result object will be same.

A - true

B - false

Q 3 - Which of the following describes the Flyweight 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 is primarily used to reduce the number of objects created and to decrease memory footprint and increase performance.

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

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 - In which of the following pattern, a class behavior or its algorithm can be changed at run time?

A - State Pattern

B - Null Object Pattern

C - Strategy Pattern

D - Template Pattern

Q 7 - Which of the following describes the Intercepting 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 describes the Transfer Object 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 - In MVC pattern, Model represents an object or JAVA POJO carrying data. It can also have logic to update controller if its data changes.

A - true

B - false