Design Patterns Part 2

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Questions and Answers

When is it appropriate to use the Prototype design pattern?

When you require a single instance to manage shared resources.

When you need multiple instances of a class for different configurations.

When you want to enforce a certain number of subclasses.

When your code should not depend on concrete classes of objects that need to be copied. (correct)

What is a primary characteristic of the Singleton design pattern?

It prevents subclasses from being created from the main class.

It allows multiple instances of a class to be created.

It restricts the instantiation of a class to a single instance. (correct)

It ensures that classes can have variable instance counts.

Which of the following is a recommended implementation step for a Singleton?

Make the constructor public for easy instantiation.

Use several static creation methods for diverse object configurations.

Make the default constructor private. (correct)

Allow multiple access points for different instances.

Why would a developer use the Singleton pattern in their program?

To ensure that a single instance is used for shared resources, like a database. Signup and view all the answers

What does the Prototype pattern help reduce in terms of class hierarchy?

The number of subclasses that differ merely in initialization. Signup and view all the answers

What is the primary function of the Factory Method design pattern?

To provide an interface for creating objects with subclasses deciding the class Signup and view all the answers

When should the Factory Method pattern be applied?

When you want to save system resources by reusing existing objects Signup and view all the answers

Which of the following statements about the Factory Method is incorrect?

It provides a concrete implementation for object creation. Signup and view all the answers

What is a potential benefit of using the Factory Method pattern?

It separates the creation of objects from their usage. Signup and view all the answers

Which of the following is NOT a characteristic of the Factory Method design pattern?

It enforces the use of a single concrete class. Signup and view all the answers

In what scenario is the Abstract Factory pattern preferred over the Factory Method?

When multiple families of related or dependent objects need to be created. Signup and view all the answers

Which design pattern category does the Factory Method belong to?

Creational Signup and view all the answers

What could be a drawback of using the Factory Method pattern?

Increased complexity in code management Signup and view all the answers

What is the main purpose of the Abstract Factory Pattern?

To provide an interface for creating families of related objects. Signup and view all the answers

When should you consider using the Builder Pattern?

When you want to create complex objects that could have various representations. Signup and view all the answers

What issue does the Builder Pattern help mitigate?

A telescopic constructor that complicates object creation. Signup and view all the answers

What describes the function of the Prototype Pattern?

To create new objects by cloning a prototypical instance. Signup and view all the answers

In which scenario would the Abstract Factory Pattern NOT be appropriate?

When managing a single type of product is required. Signup and view all the answers

What is a key characteristic of a well-designed program regarding class responsibilities?

Each class should be responsible for a single functionality. Signup and view all the answers

What role does the Factory Method play in relation to the Abstract Factory Pattern?

It acts as a specific implementation of the Abstract Factory. Signup and view all the answers

Which of the following is NOT a reason to use the Builder Pattern?

To create single instances of a specific object. Signup and view all the answers

What is the primary scenario for using the Singleton pattern in software design?

To ensure all clients share a single instance of a class. Signup and view all the answers

Which of the following describes an advantage of the Prototype design pattern?

It prevents the need for creating subclasses to manage configurations. Signup and view all the answers

Which of the following is a method to implement the Singleton pattern?

Ensure the default constructor is private. Signup and view all the answers

In what circumstance would using the Prototype pattern be beneficial?

When there is a need to duplicate an object without understanding its class structure. Signup and view all the answers

What could be a consequence of incorrectly applying the Singleton pattern?

Unintentional creation of multiple instances leading to inconsistent behavior. Signup and view all the answers

When is it appropriate to utilize the Factory Method design pattern?

When subclasses should determine which class to instantiate. Signup and view all the answers

What advantage does the Factory Method provide in managing system resources?

It enables the reuse of existing objects instead of rebuilding them. Signup and view all the answers

Which scenario exemplifies an ideal application of the Factory Method?

When you need to allow client classes the flexibility to instantiate various subclasses. Signup and view all the answers

What structure is commonly employed to describe design patterns such as the Factory Method?

A consistent template divided into sections. Signup and view all the answers

Which of the following statements is true regarding the Factory Method?

It allows subclass implementations to define object instantiation. Signup and view all the answers

In what situation is the Factory Method a preferred approach over direct instantiation?

When you wish to separate instantiation logic from the application's main logic. Signup and view all the answers

What is a primary reason for utilizing the Factory Method pattern when dealing with a library or framework?

To empower users to extend internal components of the library or framework. Signup and view all the answers

What is the primary benefit of using the Abstract Factory pattern in code development?

It provides an interface for creating families of related objects without revealing the concrete implementations. Signup and view all the answers

Which of the following best describes an appropriate scenario for applying the Builder pattern?

When eliminating various constructors in favor of a single build process. Signup and view all the answers

What does the Prototype pattern primarily aim to achieve in object creation?

It reduces class dependencies by creation through copying existing instances. Signup and view all the answers

In which situation should the Abstract Factory pattern NOT be applied?

When the exact concrete classes of products are known and fixed. Signup and view all the answers

What is a common consequence of mixing responsibility within a class using the Factory Methods?

Reduced readability and maintainability of the code structure. Signup and view all the answers

What does the Builder pattern help to eliminate in object construction?

Telescoping constructor anti-patterns. Signup and view all the answers

Which statement is false regarding the responsibilities of classes in a well-designed program?

Classes can take on multiple responsibilities to reduce code complexity. Signup and view all the answers

Which situation warrants the use of the Builder pattern for constructing objects?

When you are managing complex object trees that require diverse representations. Signup and view all the answers

Which of the following statements about the Prototype pattern is accurate?

It works by cloning an existing instance to create new objects. Signup and view all the answers

What is a key reason for using the Abstract Factory pattern instead of hard coding product types?

It allows for dynamic selection of product families at runtime. Signup and view all the answers

Study Notes