http://www.iteye.com/problems/86110

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List
     
       list = billFacade.findBillByUserId(userInfo); Map
      
        group = new HashMap
       
        ();String type = null;Float moneyTotal = 0f;for(Bill bill : list){type = bill.getType();            moneyTotal = group.get(type);            if(moneyTotal == null){                moneyTotal = 0f;            }            group.put(type, moneyTotal + bill.getMoney());        }