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JFlex is a lexical analyzer generator (also known as scanner generator) for Java™, written in Java.

There is a newer version: 1.8.2

package java_cup.runtime;

/**
 * Defines the Scanner interface, which CUP uses in the default
 * implementation of lr_parser.scan().  Integration
 * of scanners implementing Scanner is facilitated.
 *
 * @version last updated 23-Jul-1999
 * @author David MacMahon 
 */

/* *************************************************
  Interface Scanner
  
  Declares the next_token() method that should be
  implemented by scanners.  This method is typically
  called by lr_parser.scan().  End-of-file can be
  indicated either by returning
  new Symbol(lr_parser.EOF_sym()) or
  null.
 ***************************************************/
public interface Scanner {
    /** Return the next token, or null on end-of-file. */
    public Symbol next_token() throws java.lang.Exception;
}