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There seems to be a lot of confusion around the topic of constants in Java. Some people make use of integers or Strings to define constants, while others make use of enums.
I’ve also come across constants defined in their own interface – where classes that make use of the constants have to implement the interface. This strategy is often referred to as the interface constant design pattern.
Check out this video and learn how to work with enums properly — and not just use them as plain string value replacements.
Using enumeration, or enums, to manage state is a useful option to make code less fragile and more robust by replacing state scenarios that shouldn’t be possible with solutions that make them impossible.
Wait – how do you end up in a state that shouldn’t be possible?
A design pattern is defined as the re-usable form of a solution to a design problem. With a design pattern, you can document a solution to a design problem. Design patterns were introduced by the architect Christopher Alexander and have been adapted for various other disciplines and are very popular among developers, as they provide solutions to general problems that software developers face. It provides a template to solve common problems while designing a system or an application.
Design patterns act as a common language between developers so that each developer easily understands the concept while working with common problems.