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

Singleton pattern is one of the simplest design patterns in Java. This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object.This pattern involves a single class which is responsible to create an object while making sure that only single object gets created. This class provides a way to access its only object which can be accessed directly without need to instantiate the object of the class.

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

A - false

B - true

Answer : B

Explanation

true. Event handling frameworks like swing, awt use Observer Pattern.

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 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

Answer : C

Explanation

In Strategy pattern, a class behavior or its algorithm can be changed at run time.

Q 8 - Which of the following pattern creates object without exposing the creation logic to the client and refer to newly created object using a common interface?

A - Factory Pattern

B - Abstract Factory Pattern

C - Singleton Pattern

D - Transfer Object Pattern

Answer : A

Explanation

Factory Pattern creates object without exposing the creation logic to the client and refer to newly created object using a common interface.

Q 9 - Which type of design patterns are specifically concerned with communication between objects?

A - Creational Design Patterns

B - Structural Design Patterns

C - Behavioral Design Pattern

D - J2EE Design Patterns

Answer : C

Explanation

Behavioral Design Patterns are specifically concerned with communication between objects.

Answer : A

Explanation

Business Object , Transfer Object, Client are the entities of Transfer Object pattern.


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