Use the class in any way you need, but modifying its behavior comes by adding new code, never by modifying the old. You can consider this when you are writing your classes. It can be extended if need be, but it can never be modified. Any class (or whatever you write) should be written in such a way that it can be used as is. Here, the idea is that an entity allows its behavior to be extended but never by modifying its source code. “Software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification.” If you’re interested in knowing a bit more about the SRP principle, here’s a post you will enjoy reading.
#Single responsibility principle uml code
When a class has more than a single responsibility, those responsibilities become coupled and this coupling can lead to a fragile code base that is difficult to refactor when your requirements emerge. We care about separating the functionalities because each responsibility is an access of change. So if we have more than one reason to change, the functionality will be split into two classes and each will handle its own responsibility. It is much more difficult to understand and edit a class when it has various responsibilities. This principle will lead to a stronger cohesion in the class and looser coupling between dependency classes, better readability, and code with lower complexity. Here, when we talk about a responsibility, we mean a reason to change. “There should be never more than one reason for a class to change.”Īs you can see, this principle states that an object/class should only have one responsibility and that it should be completely encapsulated by the class. Let’s look at each principle individually to understand why S.O.L.I.D can help developers to build quality software.
#Single responsibility principle uml software
Basically, SOLID principles help software developers to achieve scalability and avoid that your code breaks every time you face a change. The system created becomes easy to maintain, to reuse and to extend over time. The idea is that, by applying those principles together, you are able to write better quality code that is robust. Martin in the early 2000s.Īs you know, to get a working software, we should have a low coupling, high cohesion and strong encapsulation, which is something that the SOLID principles help us obtain. In case you didn’t know it, in computer programming, the SOLID principles acronym was introduced by Michael Feathers for five principles that were defined by Robert C. Today I would like to talk about S.O.L.I.D., the first five principles of object-oriented programming that are essential for building working software.
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