Polymorphism

By Raul Rios

In order to try and explain the important topic of polymorphism in Java, I will use the following class hierarchy as an example:


  class Device { }

  class MobileDevice extends Device {}
  class DesktopDevice extends Device {}
  class WearableDevice extends Device {}

class Device { }

class MobileDevice extends Device {}

class DesktopDevice extends Device {}

class WearableDevice extends Device {}

Given this class hierarchy, what could we say about MobileDevice? It’s a descendant from Device (and implicitly from Object) so we could say: A MobileDevice is a ..Continue Reading