Ad 1. Yes. See Minim and other contributed sound libraries.

Ad 2. It seems you are using a translator, but I'm assuming your actual question is if there are examples of works like these that are shown on the web. See the vimeo videos of Diana Lange. She posted some of her sketches to OpenProcessing as well.

amnon.owed,

What you describe is exactly what I already linked to. Diana's work is audio-reactive, the visuals change according to the audio, for example this video. Also check out this video where she compares different Processing audio analysis libraries. Also check out the work of Robert Hodgin, for example here, here and here.

On a sidenote, this is an english-language forum. I understand this can be difficult if you do not speak english, but it is the language that is used on this forum for two important reasons. First, it's easier to communicate effectively if everyone speaks the same language (as this thread shows once more). Second, if the information is written in english, then as many people as possible can benefit from it.