Abstract classes and interfaces in java (often tested in interviews, important)!!

abstract class rule of grammar In the example of polymorphic code about Shape, we find that the draw method in the parent class Shape does not seem to have any actual work, and the main drawing graphics are completed by the draw methods of various subclasses of Shape. Like this method without actual work, we can design it as an abstract m ...

Posted on Wed, 29 Sep 2021 18:23:15 -0400 by jjbarnone