title: UnsupportedOperationException on Collection
body: <p>While studying the <code>Collection</code> API, we find that some methods (<code>add</code>, <code>remove</code>,...) may throw a <code>java.lang.UnsupportedOperationException</code> if the current implementation of the Collection does not support those functionalities.</p>
  
  <p>Is there,actually, in the JDK, a concrete <code>Collection</code> that does not support those methods ?</p>
  
  <p>Thanks a lot for your answers.</p>