Review main actors in the core to make sure they are structured as an interface (I*) plus an abstract implementation (which allows to easily implement and make implementations less affected by change.

The SOLID open-closed principle in Java asserts that a well-designed software component will be open for ongoing extension, but closed to edits and modification. In other words, a Java class that ...

Interface Segmentation, also called the Interface Segregation Principle, one of the core principles of object-oriented design. This project demonstrates the ISP. According to ISP, no client should be ...

There are only half a dozen classes you really need to master to become competent in the world of functional programming. The java.util.function package contains well over 40 different components, but ...