fichier en argument du main

bonsoir ce code est pris du site de sun consernant la reconnaissse vocale

Code:

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public static void main(String args[]) {
        try {
            // Create a recognizer that supports English.
            rec = Central.createRecognizer(
                            new EngineModeDesc(Locale.ENGLISH));
 
            // Start up the recognizer
            rec.allocate();
 
            // Load the grammar from a file, and enable it
            FileReader reader = new FileReader(args[0]);
            RuleGrammar gram = rec.loadJSGF(reader);
            gram.setEnabled(true);
 
            // Add the listener to get results
            rec.addResultListener(new HelloWorld());
 
            // Commit the grammar
            rec.commitChanges();
 
            // Request focus and start listening
            rec.requestFocus();
            rec.resume();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
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jai pas compris cette instruction
FileReader reader = new FileReader(args[0]);

merci