Abstract: A Java keyword used in a class definition to specify that a class is not to be instantiated, but rather inherited by other classes. An abstract class can have abstract methods that are not implemented in the abstract class, but in subclasses.Abstract class: A class that contains one or more abstract methods, and therefore can never be instantiated. Abstract classes are defined so that other classes can extend them and make them concrete by implementing the abstract methods.Abstract method: A method that has no implementation.Abstract Window Toolkit (AWT): A collection of graphical user interface (GUI) components that were implemented using native-platform versions of the components. These components provide that...