Design Patterns Online Quiz

Q 1 - Which of the following is correct about Singleton design pattern.

A - This type of design pattern comes under creational pattern.

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

C - Singleton class provides a way to access its only object which can be accessed directly without need to instantiate the object of the class.

D - All of the above.

Q 2 - Event handling frameworks like swing, awt use Observer Pattern.

A - false

B - true

Q 3 - Which of the following pattern is used when creation of object directly is costly?

A - Bridge Pattern

B - Adapter Pattern

C - Prototype Pattern

D - Filter Pattern

Q 4 - In which of the following pattern a class represents functionality of another class?

A - Proxy Pattern

B - Chain of Responsibility Pattern

C - Command Pattern

D - Interpreter Pattern

Q 5 - Which of the following pattern is used to get a way to access the elements of a collection object in sequential manner without any need to know its underlying representation?

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 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 describes the Singleton 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 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 - 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