. Lexer calls this method if it
 had already read some characters, but could not use them to match a
 (longer) token. So, they will be used again as the prefix of the next
 token and it is the implemetation's responsibility to do this right.</div>
</li>
</ul>
<a name="BeginToken()">
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<h4>BeginToken</h4>
<pre>char&nbsp;BeginToken()
                throws <a href="http://download.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true