Summary Java is a widely used object-oriented programming language and software platform that runs on billions of devices, including notebook computers, mobile devices, gaming consoles, medical devices and many others. The rules and syntax of Java are based on th

Chapter 6 Class Inheritance
) Superclasses and Subclasses
) Keywords: super
) Overriding methods
) The Object Class
) Modifiers: protected, final and
abstract
) Polymorphism and Object Casting
) Interfaces
) Inner Classes
) Program Development and Class Design

, Chapter 6 Class Inheritance
) Objective: derive a new class from existing class
) Recognize the path of inheritance of classes in JDK
) Inherence model is the "is-a-relationship", not a
"has-relationship"
) WelcomeApplet is an inherited class from Applet
) All of the classes you use or define are implicitly
inherited from the top class, Object

, Superclasses and Subclasses

Superclass Circle Circle Methods Circle Data



Inheritance



Cylinder Circle Methods Circle Data
Subclass
Cylinder Methods Cylinder Data

, Superclass Subclass

Class name Circle Cylinder

data -radius -radius
-length
+getRadius
method +setRadius() +getRadius
+findArea() +setRadius()
+findArea()

inherit +getLength()
+setLength()
+findVolume()
UML Diagram