| An abstract method has no body and must be defined in some subclass of the class in which they are declared. |
| Constructors, static methods, private methods cannot be abstract |
| A method that overrides a superclass method cannot be abstract |
| Classes that contain abstract methods and classes that inherit abstract methods without overriding them are considered abstract classes |
| It is compile-time error to instantiated an abstract class or attempt to call an abstract method directly. |