Design Patterns Online Quiz


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Following quiz provides Multiple Choice Questions (MCQs) related to Design Patterns Framework. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Questions and Answers

Answer : D

Explanation

Factory pattern is one of most used design pattern in Java. This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object. In Factory pattern, we create object without exposing the creation logic to the client and refer to newly created object using a common interface.

Q 2 - Runtime class is an example of singleton.

A - true

B - false

Answer : A

Explanation

true. Each java application uses Runtime as a single object.

Q 3 - Which of the following pattern is used where we need to treat a group of objects in similar way as a single object?

A - Composite Pattern

B - Facade Pattern

C - Flyweight Pattern

D - Decorator Pattern

Answer : A

Explanation

Composite Pattern is used where we need to treat a group of objects in similar way as a single object.

Q 4 - Which of the following pattern allows a user to add new functionality to an existing object without altering its structure?

A - Composite Pattern

B - Facade Pattern

C - Flyweight Pattern

D - Decorator Pattern

Answer : D

Explanation

Decorator Pattern allows a user to add new functionality to an existing object without altering its structure.

Q 7 - Which of the following pattern is used in EJB persistence mechanism?

A - Visitor Pattern

B - MVC Pattern

C - Business Delegate Pattern

D - Composite Entity Pattern

Answer : D

Explanation

Composite Entity pattern is used in EJB persistence mechanism.

Q 8 - Which of the following pattern is used to provide a centralized request handling mechanism so that all requests will be handled by a single handler?

A - DAO Pattern

B - Front Controller Pattern

C - Intercepting Pattern

D - Service Locator Pattern

Answer : B

Explanation

Front Controller Pattern is used to provide a centralized request handling mechanism so that all requests will be handled by a single handler.

Q 9 - Which type of design patterns are specifically concerned with the presentation tier?

A - Creational Design Patterns

B - Structural Design Patterns

C - Behavioral Design Pattern

D - J2EE Design Patterns

Answer : D

Explanation

J2EE Design Patterns are specifically concerned with the presentation tier.

Answer : C

Explanation

Filter, Filter Chain, Target, Filter Manager, Client are the entities of Intercepting pattern.

design_pattern_questions_answers.htm
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