Post-Test Creational Design Pattern

Singleton is appropriate when:

• You need a single instance of a class

• You need to choose what type of object to create

• You need to access an object anywhere in the program

• You need to use an object without knowing its subclass

This provides an interface for creating objects in a superclass but allows subclasses to alter the type of object that will be created.

• Singleton Pattern

• Factory Method Pattern

• Prototype Pattern

• Abstract Factory Pattern

When you want to create concrete products without having many conditionals in the code, you can use:

• Singleton

• Builder

• Factory Method

A Singleton is used when you want to guarantee one instance:

• true

• false

The SOLID principles of object-oriented design are applied to software development projects to make software easier to change when requirements changes.

• True

• False

Which of the following best describes a creational design pattern?

• A pattern that describes how objects communicate with each other

• A pattern that describes how to store and retrieve objects from a database

• A pattern that describes how to create objects

• A pattern that describes how to modify objects

Which of these design principles does the factory method pattern follow?

• The Open-Closed Principle (OCP)

• The Single Responsibility Principle (SRP)

• The Dependency Inversion Principle (DIP)

• The Liskov Substitution Principle (LSP)

What is the main advantage of using the abstract factory pattern?

• It simplifies the creation of objects

• It improves the performance of the system

• It reduces the amount of code needed to create objects

• It allows for the creation of families of related objects

The purpose of the Singleton Pattern is to ensure that a class is immutable.

• TRUE

• FALSE

What is the purpose of using a synchronized block when implementing the Singleton pattern?

• To ensure that only one instance of the Singleton class is created

• To avoid race conditions when accessing the Singleton instance

• To enforce the Singleton constraint on the class

• To reduce the memory usage of the Singleton instance