I haven't written any I/O Java code in a while, but I do remember using java.io.PrintStream which is a buffered stream, so you don't need to create a whole mess of inline class instances.


import...

There is no atomic "type" in Java.

All of the classes in the java.util.concurrent.atomic package have the "Atomic" prefix in their names.

All of those classes "...provide atomic access to...

It appears you have a superfluous opening parenthesis just before the FORMAT call:

(defun adder ()
(format t "Enter a number, press return and enter another number")
(setq number-one (read))...