Java Question

i am new to your site and i found out that you can frequently ask question.
i wanted to ask if it was possible that one should program a computer with javain such a way that the computer can recieve input through sound. that is the computer will here a particular sound and perform a particular function.
if this is possible please i ask you to help me in any way you can.
please i will like to recieve my asnwer through my mail.

thanks.