title: Compute a Java function's signature
body: <p>Is there a way to <strong>compute</strong> a Java class's method's signature? A signature<br>
  like <code>([Ljava/lang/String;)V</code> represents a function that takes a <code>String[]</code> as argument<br>
  and returns <code>void</code>.  </p>
  
  <p>What's the <em>rule</em> to compute the signature?</p>