title: ANTLR: Is there a simple example?
body: <p>I'd like to get started with ANTLR, but after spending a few hours reviewing the examples at the <a href="http://www.antlr.org/" rel="noreferrer">antlr.org</a> site, I still can't get a clear understanding of the grammar to Java process.</p>
  
  <p>Is there some simple example, something like a four-operations calculator implemented with ANTLR going through the parser definition and all the way to the Java source code?</p>