n, only the <code>class</code> keyword
and the class name are required. The others are optional. If you do not make
an explicit declaration for the optional items, the Java compiler assumes
certain defaults.
<p>
The class name must be a valid Java identifier (that is, it must be a string
of letters that begins with a Unicode letter, that contains only Unicode
letters and digits, and that is not the same as any Java keyword).
By convention, class names begin with a capital letter.
<p>
So, the most simple cla