What are the differences between design patterns?

What are the main differences 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 is used to create 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, like different types of user notifications.

Are there any other design patterns that are similar to these?

Yes, the Abstract Factory pattern is similar to the Factory pattern but allows for the creation of families of related or dependent objects. The Builder pattern is another one that focuses on constructing complex objects step by step.

How do I decide which design pattern to use in my project?

Consider the specific problem you're trying to solve, the complexity of your system, and the relationships between objects. Each pattern has its strengths and weaknesses, so understanding your requirements is key.