Design Patterns Quiz: Singleton, Factory, Adapter

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Creational and Structural patterns in Java

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Design Patterns Quiz: Singleton, Factory, Adapter


Design Patterns Quiz: Singleton, Factory, AdapterVersión en línea Creational and Structural patterns in Java por santosh saini 1 What is the primary purpose of the Singleton pattern? a To ensure a class has only one instance and provides a global access point. b To copy objects with the same state c To create multiple instances for parallel tasks d To serialize objects for storage without duplication 2 Which Java method is commonly used to obtain the Singleton instance (with thread-safety considerations)? a new Singleton() b initialize() c create() d getInstance() (with synchronization or double-checked locking) 3 A Singleton often introduces what risk, especially in tests or complex systems? a Global shared state and tight coupling b Decoupled design c Improved performance d Increased modularity 4 Which statement best describes the Factory Method pattern? a Creates a single global instance of a class b Uses reflection to instantiate any class at runtime c Directly instantiates concrete classes in the client d Defines an interface for creating objects, subclasses decide which class to instantiate 5 When should you prefer a Factory Method over direct instantiation? a When you want to expose internal constructors b When you require inheritance for all classes c When you need a class hierarchy with many singletons d When a class cannot anticipate the object type it must create 6 What does the Adapter pattern accomplish? a Converts the interface of a class into another interface the client expects b Creates a new class hierarchy for shared behavior c Inlines a class to reduce overhead d Removes dependencies between subsystems 7 In Java, which approach is typically used by an Adapter to increase flexibility: Class Adapter or Object Adapter? a Both are equally flexible in all scenarios b Class Adapter (inheritance) is more flexible c Neither supports delegation d Object Adapter (composition) tends to be more flexible 8 Which statement is NOT a Creational pattern? a Builder b Factory Method c Adapter d Singleton 9 What is a common multithreading concern for Singletons? a They automatically synchronize access b They cannot be serialized c Race condition can create multiple instances without proper synchronization d They ignore garbage collection 10 In the Adapter pattern, what is the typical way to implement the adaptation? a Implement the target interface and delegate calls to the adaptee b Inherit the adaptee and override methods c Use reflection to map interfaces d Expose the adaptee’s methods directly

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Design Patterns Quiz: Singleton, Factory, Adapter

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Design Patterns Quiz: Singleton, Factory, AdapterVersión en línea

por santosh saini

What is the primary purpose of the Singleton pattern?

Which Java method is commonly used to obtain the Singleton instance (with thread-safety considerations)?

A Singleton often introduces what risk, especially in tests or complex systems?

Which statement best describes the Factory Method pattern?

When should you prefer a Factory Method over direct instantiation?

What does the Adapter pattern accomplish?

In Java, which approach is typically used by an Adapter to increase flexibility: Class Adapter or Object Adapter?

Which statement is NOT a Creational pattern?

What is a common multithreading concern for Singletons?

In the Adapter pattern, what is the typical way to implement the adaptation?