- 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
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Q 1 - Which of the following is correct about Structural design patterns.
A - These design patterns are specifically concerned with communication between objects.
Answer : C
Explanation
Structural design patterns concern class and object composition. Concept of inheritance is used to compose interfaces and define ways to compose objects to obtain new functionalities.
Q 2 - Which of the following describes the Bridge pattern correctly?
A - This pattern builds a complex object using simple objects and using a step by step approach.
B - This pattern refers to creating duplicate object while keeping performance in mind.
C - This pattern is used when creation of object directly is costly.
Answer : D
Explanation
Bridge pattern is used when we need to decouple an abstraction from its implementation so that the two can vary independently.
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 Proxy 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 : A
Explanation
In proxy pattern, a class represents functionality of another class. This type of design pattern comes under structural pattern. In proxy pattern, we create object having original object to interface its functionality to outer world.
Q 5 - Which of the following pattern is used to reduce communication complexity between multiple objects or classes?
Answer : B
Explanation
Mediator pattern is used to reduce communication complexity between multiple objects or classes.
Q 6 - In which of the following pattern, a null object replaces check of NULL object instance?
Answer : B
Explanation
In Null Object pattern, a null object replaces check of NULL object instance.
Q 7 - In which of the following pattern, a visitor class is used which changes the executing algorithm of an element class?
Answer : A
Explanation
In Visitor pattern, a visitor class is used which changes the executing algorithm of an element class.
Q 8 - Which of the following pattern involves a single class which is responsible to create an object while making sure that only single object gets created?
Answer : C
Explanation
Singleton Pattern involves a single class which is responsible to create an object while making sure that only single object gets created.
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 Transfer Object pattern?
A - Business Object , Transfer Object, Client
Answer : A
Explanation
Business Object , Transfer Object, Client are the entities of Transfer Object pattern.