title: Using jTransforms library on a WAV file?
body: <p>I am trying to do spectral analysis on a WAV file using the jTransforms library: <a href="https://sites.google.com/site/piotrwendykier/software/jtransforms" rel="nofollow">Official Site</a></p>
  
  <p>But I have problems on how to convert the WAV file into an acceptable input for FFT using jTransforms, and how can I display a frequency spectrum after FFT? I have searched around Google and found I need to somehow convert the WAV file into a <code>double[]</code> or <code>Complex[]</code>, and afterwards how should I interpret the output?</p>
  
  <p>Sorry I am very new to FFT so this question may sound extremely stupid. Many thanks!</p>