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Here's a nifty example of using the Java Speech API to control a lego mindstorm robot:

Lejos Speech control example

The JSGF speech grammar is pretty simple:

grammar rover;

public  = forwards {forwards} 
                 | backwards {backwards}
                 | back {backwards}
                 | reverse {backwards}
                 | stop {stop}
                 | left {left}
                 | right {right}
                 | up {up}
                 | down {down}
                 | whoa {stop}
                 | halt {stop}
                 | spin {left}
                 | go {forwards};

public  = Good bye {bye} | So long {bye} | Shut down {bye};