I did not mean that actually
I can set the display name by 
                        @Override
                        public String getDisplayValue(Car car) {
                                return car.getName();
                        }
I tried to set the value of the option by below function:
                       @Override
                        public String getIdValue(Car car, int index) {
                                return String.valueOf(carList.get(index));
                        }
I want to set value but value comes as null
BMW


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Developer
Wicket
Java
JSP
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