What is the difference between the Template Pattern and the Strategy Pattern?

What is the difference between the Template Pattern and the Strategy Pattern?

The Template Pattern defines the skeleton of an algorithm in a method, allowing subclasses to redefine certain steps without changing the algorithm's structure. In contrast, the Strategy Pattern enables selecting an algorithm's behavior at runtime by encapsulating algorithms in separate classes.

Can you give me an example of each pattern?

Sure! For the Template Pattern, consider a game where the main game loop is defined in a base class, but specific game types implement their own rules. For the Strategy Pattern, think of a payment system where different payment methods (like credit card, PayPal) are encapsulated in their own classes, allowing the user to choose at runtime.

When should I use one pattern over the other?

Use the Template Pattern when you have a fixed algorithm structure but need flexibility in certain steps. Use the Strategy Pattern when you want to switch between different algorithms or behaviors dynamically.

Are there any drawbacks to using these patterns?

Yes, the Template Pattern can lead to a rigid structure if overused, while the Strategy Pattern can increase the number of classes, making the system more complex.