How to fire sounds with various frequencies

Hello,
I'm willing to create a program to check how people hear sounds and plot curves based on audible frequencies.
Are there java classes to play a sound at a particular frequency. ?
I'm running Windows XP on a PC with just speakers and earphone.
Thanks to point me to the good package (if it exists) or to provide me with a sample code.

There's a bug in the forum software that's inserting
a space when displaying long urls, like here:
c2coff=1& q=test
Darn, didn't notice the blanks. Usually they're more obvious.
b) searching for the keywords you used doesn'tbring
up any code as far as I saw. Funnily, though, it
returns this thread...Then I guess that you skipped over this one:
http://www.softsynth.com/jsyn/tutorial/
(#10 in the list)
and this one:
http://javaboutique.internet.com/audio/
Very probably. All I saw on my list were online hearing tests, but no code. :) Thanks.

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How to fire sounds with various frequencies

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