Creational Design Patterns
- Design Patterns - Factory Pattern
- Abstract Factory Pattern
- Design Patterns - Singleton Pattern
- Design Patterns - Builder Pattern
- Design Patterns - Prototype Pattern
Structural Design Patterns
- 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
Behavioral Design Patterns
- 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 - Strategy Pattern
- Design Patterns - Template Pattern
- Design Patterns - Visitor Pattern
J2EE Design Patterns
- Design Patterns - Null Object 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 Useful Resources
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 true about design patterns?
Answer : D
Explanation
Design patterns represent the best practices used by experienced object-oriented software developers. Design patterns are solutions to general problems that software developers faced during software development. These solutions were obtained by trial and error by numerous software developers over quite a substantial period of time.
Answer : A
Explanation
true. Wrapper classes like Integer, Boolean uses Decorator pattern.
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?
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 describes the Interpreter 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 : C
Explanation
Interpreter pattern provides a way to evaluate language grammar or expression. This type of pattern comes under behavioral pattern. This pattern involves implementing an expression interface which tells to interpret a particular context.
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 - Which of the following describes the Strategy 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 : C
Explanation
In Strategy pattern, a class behavior or its algorithm can be changed at run time.
Q 7 - Which of the following pattern is used to separate low level data accessing API or operations from high level business services?
Answer : A
Explanation
DAO Pattern is used to separate low level data accessing API or operations from high level business services.
Q 8 - Which of the following pattern is used when we want to locate various services using JNDI lookup?
Answer : D
Explanation
Service Locator Pattern is used when we want to locate various services using JNDI lookup.
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 Front Controller pattern?
A - Front Controller, Dispatcher, View
B - Front Controller, Dispatcher
Answer : A
Explanation
Front Controller, Dispatcher, View are the entities of Front Controller pattern.