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Perfect Singleton
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Creational Patterns
Creational Design Pattern
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Factory Pattern
Factory Method-Exercise
Factory Method Structure
Factory Method Consequences
Structural Patterns
Structural Pattern Example
StructuralPatterns Help Programmers
Patterns Help Programmers
Common Structural Patterns
Flyweight Pattern Motivation
Flyweight Suitability
FlyweightPattern Structure
FlyweightConsequences
Class Vehicles Intersection
Structural Patterns Conclusion
Behavioral Patterns
Define Behavioral Patterns
BehavioralPatterns Help Programmers
Common Behavioral Patterns
Observer Pattern Motivation
ObserverStructure TimeObserver Interface
TimeClass AsObserved Object
Observer Pattern Tradeoffs
Problems Require Mediator
Mediator Pattern Applicability
Mediator Pattern Structure
Benefits Pitfalls MediatorPattern
MediatorClass Course Project
Behavioral DesignPatterns Conclusion
Designing Software
How to Choose Pattern
How To Apply Pattern
Lessons Learned
Combine Design Patterns
Design Pattern Limitations
Traffic flow System
Course Conclusion
Common Behavioral Patterns - Quiz
Each question is worth one point. Select the best answer or answers for each question.
1.
In Java 21+, which pattern is most directly supported by sealed classes and pattern matching in switch expressions as a modern alternative to classic double-dispatch?
Please select the best answer.
A.
Chain of Responsibility
B.
Visitor
C.
Strategy
D.
Mediator
2.
The GoF Observer pattern is foundational to modern reactive programming in Java. Which of the following represents the current Java standard API for reactive publish-subscribe streams, introduced in Java 9?
Please select the best answer.
A.
java.util.Observable
B.
java.util.EventListener
C.
java.util.concurrent.Flow
D.
java.beans.PropertyChangeListener
3.
Which of the following patterns allows multiple objects an opportunity to process a request without guaranteeing that any of them must process it?
Please select the best answer.
A.
Chain of Responsibility
B.
Command
C.
Memento
D.
Mediator
4.
Which of the following is an object pattern that encapsulates interchangeable algorithms in objects so the algorithm can vary independently of the classes that use it?
Please select the best answer.
A.
Chain of Responsibility
B.
Command
C.
Strategy
D.
Mediator
Submit