What is the difference between the Singleton and Factory design patterns?

What is the difference between the Singleton and Factory design patterns?

The Singleton pattern ensures a class has only one instance and provides a global point of access to it. In contrast, the Factory pattern creates objects without specifying the exact class of object that will be created.

Can you give me an example of when to use each pattern?

Sure! Use the Singleton pattern when you need to control access to a shared resource, like a configuration manager. Use the Factory pattern when you want to create objects that share a common interface but may have different implementations.

Are there any drawbacks to using these patterns?

Yes, the Singleton pattern can introduce global state, making testing difficult. The Factory pattern can lead to more complex code if overused.

Which pattern is more commonly used in modern software development?

Both patterns are widely used, but the Factory pattern is often preferred for its flexibility and ease of testing.