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

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

The Strategy Pattern defines a family of algorithms, encapsulates each one, and makes them interchangeable. The Template Method, on the other hand, defines the skeleton of an algorithm in a method, deferring some steps to subclasses.

Can you give me an example of each pattern?

Sure! For the Strategy Pattern, consider a sorting algorithm where you can choose between quicksort and mergesort. For the Template Method, think of a game where the main game loop is defined, but specific actions like player moves are implemented in subclasses.

When should I use one over the other?

Use the Strategy Pattern when you need to switch algorithms at runtime. Use the Template Method when you want to define a common structure for algorithms but allow subclasses to implement specific behaviors.

Are there any drawbacks to using these patterns?

Yes, the Strategy Pattern can lead to a proliferation of classes, while the Template Method can make the base class complex if too many variations are added.