27.3. Classification of Design Patterns

Try these first

1. 1.

   What does the Singleton Pattern ensure?

   Hint

   Think about managing resources in an application.

2. 2.

   Give an example of a use case for structural patterns.

   Hint

   Consider different systems that need to interact.

3. 3.

   What is the main benefit of the Singleton Pattern?

   • Multiple instances
   • Single instance
   • No instance

   Hint

   Consider the application of a logging service.

4. 4.

   True or False: Behavioral patterns do not focus on object communication.

   • True
   • False

   Hint

   Think about how different parts of a system interact.

5. 5.

   You are tasked with designing a messaging system. Describe how you might implement the Observer Pattern.

   Hint

   Think about how emails notify users of new messages.

6. 6.

   Consider an online shopping cart application. Identify and discuss the potential use of a Command Pattern.

   Hint

   Reflect on actions you can take in an shopping app.