A good answer might be:

Yes.

In this example implementation, each card class will have its own version of the greeting() method. Since each class has a greeting(), but each one is implemented differently, it is useful to put an abstract greeting() method in the parent class. This says that each child inherits the "idea" of greeting(), but each implementation is different. Here is the class definition of the abstract class Card:

abstract class Card { String recipient; // name of who gets the card public abstract void greeting(); // abstract greeting() method }

This is a complete definition of this abstract class. Notice the abstract method. Abstract classes can (but don't have to) contain abstract methods. Also, an abstract class can contain non-abstract methods, which will be inherited by the children.

An abstract method has no body. (It has no statements.) It declares an access modifier, return type, and method signature followed by a semicolon. A non-abstract child class inherits the abstract method and must define a non-abstract method that matches the abstract method.

QUESTION 4:

Could one abstract class contain several abstract methods?