title: Java - class name starts with numbers
body: <p>I have done my HW already but our instructor wants us to submit our HWs as yourID_BFS_DFS.java. And I can't do that, it returns error. <strong>I know</strong> that numbers are not Java letters and <strong>it is illegal</strong> (I checked other answers already) but still I want to ask you guys if there is a way (maybe a trick) to do that or he simply wants us to accomplish something illegal? And if I am not wrong, java language is updated recent days, and maybe it is about that, I don't know really.</p>
  
  <p>B.t.w. I can't reach him to ask, he never replies. That's why I am asking here again.</p>