Inheritance

• Allows a programmer to reuse a class.

• Can take and existing class, clone it, and make additions and modifications to the clone.

• Original class is referred to as the base, super, or parent class.

• The clone is referred to as the derived, inherited, sub, or child class.

• Derived classes automatically inherit functionality of the base class which they may add to or override.

• In UML, inheritance is called generalization.

• In java, to implement inheritance we use the key word extends when defining the class:

• public class Ch7AddButtons extends JFrame { … }