ct methods
in a class you declare to be abstract.
</blockquote>

<h4>Final Classes</h4>
<blockquote>
You can declare a class to be final; a final class can have no subclasses.
You would a class final to guarantee that other objects and methods using
your class got exactly what they asked for. For example, the String class
in the java.lang package is a final class. The Java system must guarantee
that whenever a method or objects uses a String
they get exactly a java.lang.String and not some string that is a 