Abstract classes and interfaces in Java serve fundamentally different ... which we’ll use to implement the methods in the interface using a concrete class. Remember that an interface is a ...

protected and private concrete methods, while interfaces have all fields as automatically public, static and final. Interfaces, however, support multiple inheritances where abstract classes don't.

Abstract Factory for Dependency Injection //Factory ... well-known and dedicated places – XML configuration files (Spring IoC), special Java classes (Google Guice), or concrete factory classes. In ...