Java Tutorials

Abstract Classes and methods

• Helpful when some of the behavior is defined for most objects of a given type, but some behavior makes sense for only particular classes and not the superclass.
• Declare classes that define only part of an implementation.
• Each method not implemented in an abstract class is marked abstract.
• A class with any abstract methods must be declared abstract.
• Abstract methods must be implemented by subclasses that are not abstract themselves.