*/
public Queue<Object> parseToRPN(String val) {
rpn = new LinkedList<Object>();
opts = new LinkedList<Operator>();
Converter converter = new Converter(val);
converter.initItems();
while(!converter.isEnd()){
Object item = converter.fetchItem();
if(item instanceof Operator){
parseOperator((Operator) item);
continue;
}
rpn.add(item);