Want to see all 802.11b packets

Hello,
I am trying to write a program, running on a PC, that will view all 802.11b packets received. (I assure you that my intentions are honorable.. specifically, I am trying to design a communication protocol with a wireless device made elsewhere in my company.)
Is there any Java API/package that would give me access (read and write0 to the wireless packets my computer is receiving/sending? Or any other way of controlling the card from Java?
I am fluent in Java but know little about networking, particularly wireless networking. I've poked around a bit, but am having trouble finding info.
Thanks in advance!

Jpcap. There are two versions: one by Ken Fujii and one at SourceForge. For my money the SourceForge one is better in all but one respect, and it will be even more betterer once I've made a few contributions ;-)

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