directions for use javacc token -

i want distinguish multiple tokens.
@ code.

token : {   < loops :     < beat >   | < bass >   | < melody >    > | < #beat : "beat" > | < #bass : "bass" > | < #melody : "melody" > }  void findtype(): {token loops;} { loops = < loops > { string type = loops.image; } 

i want use findtype () function find type.
how can return correct output when input "beat"?

what want add return statement, this:

string findtype(): {token loops;} {     loops = < loops >     {       string type = loops.image;       return type;     } } 

have in mind have changed return value definition in method, void string.

then, main:

examplegrammar parser = new examplegrammar(system.in);     while (true)     {       system.out.println("reading standard input...");       system.out.print("enter loop:");       try       {         string type = examplegrammar.findtype();         system.out.println("type is: " + type);       }       catch (exception e)       {         system.out.println("nok.");         system.out.println(e.getmessage());         examplegrammar.reinit(system.in);       }       catch (error e)       {         system.out.println("oops.");         system.out.println(e.getmessage());         break;       }     } 

it generates output like:

reading standard input... enter loop:bass type is: bass reading standard input... enter loop:beat type is: beat