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 - Integer class is an example of Decorator pattern.

A - true

B - false

Q 3 - Which of the following pattern builds a complex object using simple objects and using a step by step approach?

A - Builder Pattern

B - Bridge Pattern

C - Adapter Pattern

D - Filter Pattern

Q 4 - Which of the following pattern is primarily used to reduce the number of objects created and to decrease memory footprint and increase performance?

A - Composite Pattern

B - Facade Pattern

C - Flyweight Pattern

D - Decorator Pattern

Q 5 - Which of the following describes the Memento pattern correctly?

A - This 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.

B - This pattern is used to reduce communication complexity between multiple objects or classes.

C - This pattern is used to restore state of an object to a previous state.

D - This 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.

Q 6 - In which of the following pattern, a class behavior changes based on its state?

A - State Pattern

B - Null Object Pattern

C - Strategy Pattern

D - Template Pattern

Q 7 - Which of the following pattern is used to separate low level data accessing API or operations from high level business services?

A - DAO Pattern

B - Front Controller Pattern

C - Intercepting Pattern

D - Service Locator Pattern

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 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 Intercepting pattern?

A - Filter, Filter Chain, Target, Client

B - Filter, Target, Filter Manager, Client

C - Filter, Filter Chain, Target, Filter Manager, Client

D - Filter, Filter Chain, Filter Manager, Client