Abstract classes and interfaces in Java serve fundamentally different purposes. Learn the differences between these Java language elements and how to use them in your programs.

What is an abstract class? An abstract class is a template definition of methods and variables in a specific class, or category of objects. In programming, objects are units of code, and each object ...

Item 20: Prefer interfaces to abstract classes（接口优于抽象类） Java has two mechanisms to define a type that permits multiple implementations: interfaces and abstract classes. Since the introduction of ...