- Design Patterns Tutorial
- Design Patterns - Home
- Design Patterns - Overview
- Design Patterns - Factory Pattern
- Abstract Factory Pattern
- Design Patterns - Singleton Pattern
- Design Patterns - Builder Pattern
- Design Patterns - Prototype Pattern
- Design Patterns - Adapter Pattern
- Design Patterns - Bridge Pattern
- Design Patterns - Filter Pattern
- Design Patterns - Composite Pattern
- Design Patterns - Decorator Pattern
- Design Patterns - Facade Pattern
- Design Patterns - Flyweight Pattern
- Design Patterns - Proxy Pattern
- Chain of Responsibility Pattern
- Design Patterns - Command Pattern
- Design Patterns - Interpreter Pattern
- Design Patterns - Iterator Pattern
- Design Patterns - Mediator Pattern
- Design Patterns - Memento Pattern
- Design Patterns - Observer Pattern
- Design Patterns - State Pattern
- Design Patterns - Null Object Pattern
- Design Patterns - Strategy Pattern
- Design Patterns - Template Pattern
- Design Patterns - Visitor Pattern
- Design Patterns - MVC Pattern
- Business Delegate Pattern
- Composite Entity Pattern
- Data Access Object Pattern
- Front Controller Pattern
- Intercepting Filter Pattern
- Service Locator Pattern
- Transfer Object Pattern
Design Patterns Online Quiz
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.
Q 1 - Which of the following is correct about Behavioral design patterns.
A - These design patterns are specifically concerned with communication between objects.
Answer : A
Explanation
Behavioral design patterns are specifically concerned with communication between objects.
Answer : A
Explanation
true. Wrapper classes like Integer, Boolean uses Decorator pattern.
Q 3 - Which of the following pattern is used when creation of object directly is costly?
Answer : A
Explanation
Prototype pattern is used when creation of object directly is costly.
Q 4 - Which of the following describes the Command 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.
Answer : D
Explanation
Command pattern is a data driven design pattern and falls under behavioral pattern category. A request is wrapped under an object as command and passed to invoker object. Invoker object looks for the appropriate object which can handle this command and passes the command to the corresponding object which executes the command.
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?
Answer : A
Explanation
Observer 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 - Which of the following describes the Template pattern correctly?
A - In this pattern, a class behavior changes based on its state.
B - In this pattern, a null object replaces check of NULL object instance.
C - In this pattern, a class behavior or its algorithm can be changed at run time.
D - In this pattern, an abstract class exposes defined way(s)/template(s) to execute its methods.
Answer : D
Explanation
In Template pattern, an abstract class exposes defined way(s)/template(s) to execute its methods.
Q 7 - Which of the following pattern is used to to decouple presentation tier and business tier?
Answer : C
Explanation
Business Delegate pattern is used to decouple presentation tier and business tier.
Q 8 - Which of the following describes the Transfer Object pattern correctly?
Answer : D
Explanation
Transfer Object 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 provide a way to create objects while hiding the creation logic, rather than instantiating objects directly using new opreator?
A - Creational Design Patterns
Answer : A
Explanation
Creational Design Patterns provide a way to create objects while hiding the creation logic, rather than instantiating objects directly using new opreator.
Q 10 - Which of the following is the correct list of entities of Business Delegate pattern?
A - Business Delegate, LookUp Service, Business Service
B - Client, Business Delegate, LookUp Service, Business Service
Answer : B
Explanation
Client, Business Delegate, LookUp Service, Business Service are the entities of Business Delegate Pattern.
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