Capture System Audio

I am making a screen recorder in Java and according to people on stack overflow Java is not good with audio capture and can not capture system audio output, so I want to make a JNI using a DLL in c++ to capture the system's audio. I searched Google and other things about how to do this, but I could not find anything.

In c++ how do I capture the audio being outputted by the system?
That sounds like a really cool project. Will it also record the screen? If you end up getting it right can you hit me up with a pm of the source code? I have been looking for a screen recording to start you-tubing, but the good ones are a bit pricey xD
It already records the screen I just need to get the audio working. I will be giving it away for free but not the source code.
Anyways do you know how to do this audio thing I asked?
That's cool, and unfortunately no. I only know how to have the program emit a specific set frequency, so that you could set it up to play a song, but other than that, unfortunately no. ;( and at what fps does it capture?
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