title: using numeric as enum key
body: <p>Due to an unavoidable circumstance, I need to create an enum class like below,</p>
  
  <pre><code>public enum Region
  {
   1("Region1"),
   2("Region2");
  }
  </code></pre>
  
  <p>But I'm getting an error as "Syntax error on token '1', identifier expected". This enum is used in an option tag in jsp. It works fine if use a string instead of 1, enum doesn't allow numeric as keys ? </p>