More Features of the Java Language
The previous lesson,
Objects and Classes in Java,
described features of the Java language that every Java programmer
needs to know to use objects and write classes in Java. This lesson
builds on that, discussing more features of the Java language that help
you to organize and design your code.
This section tells you what you need to know
to manage inheritance up and down from
your classes. First, it describes generally what a subclass gets from
its ancestors and specifically what every class
gets from the Object
class. Second, it discusses how to control whether your class can be
subclassed and whether its subclasses can override its methods.
You saw an example of implementing an interface in the previous
chapter. You can read more about interfaces--what they are for, why you
might need to write an interface, and all about how to write one--in
this section.
You learned how to use inner classes to implement an adapter in
Using an Inner Class to Implement an Adapter
in the previous lesson.
Inner Classes
are one type of nested classes that you will
learn about here.
This section describes how to bundle your classes into packages
and how to use classes that are in packages.
