Well, congrats on your first Java method! :)
Also, just a remark - as far as style is concerned, C/C++ and Java have different "rules" for naming methods and such... the former use the underscores, the latter uses capitalization.
That's not to say underscores are forbidden in Java, but the capitalized notation is preferable.

For example, nextCount is typical Java notation. It's C/C++ equivalent would be next_count.
Sasaki's notation is more appropriate for a Java method name.

It's a minor nitpick.

The other guys' comments stand, too.
One more thing. About calling the method - since it's not static, then it will be invoked *for* some object. So, a.AreaOfSquares(...).