Design pattern Strategy in nutshell

The behavioral strategy help us to decouple if/else code.

1. Definition

The definition in nutshell by GOF[2] is Define a family of algorithms, encapsulate each one, and make them interchangeable. Strategy lets the algorithm vary independently from clients that use it.

2. How to use

This pattern is drawn in UML for generic and example

2.1 GOF

GOF strategy diagram

2.2. Example

Example strategy diagram

Code

PrinterStrategy

Context

Main class

Conclusion

After make some tests and modeling this small example, this pattern helps to avoid a lot of if/else decisions and make the code more clear to read, decouple de algorithm as the PrintStrategy shows.

The complete code is available on my github.

References

Strategy Design Pattern in Java 8 | Baeldung

Design Patterns: Elements of Reusable Object-Oriented Software

Strategy pattern