@Override
    public void addListeners(TrainingListener... listeners) {
        if (this.trainingListeners == null) {
            setListeners(listeners);
            return;
        }

        for (TrainingListener listener : listeners)
            trainingListeners.add(listener);
    }
@ Override public void addListeners ( TrainingListener ... listeners ) { if ( this . trainingListeners == null ) { setListeners ( listeners ) ; return ; } for ( TrainingListener listener : listeners ) trainingListeners . add ( listener ) ; }
This method ADDS additional TrainingListener to existing listeners

@param listeners