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 ...

Learn the four types of polymorphism in Java, then start using subtype polymorphism to execute different forms of the same Java method. Polymorphism refers to the ability of some entities to occur ...

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.