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It turns out I was wasting my time, as the OP is already receiving help elsewhere:

http://www.java-forums.org/advanced-java/38311-java-calculator-square-root-pleas-help.html

Sorry, but saying something "doesn't work" is as useful a question as "then fix it" is a useful answer. What doesn't work about it? Do you see an Exception? Strange behavior? What did you expect to...