java list分组 list里面分装的都是对象 按照对象的属性来分组

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

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List<Bill> list = billFacade.findBillByUserId(userInfo); Map<String, Float> group = new HashMap<String, Float>(); 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()); }

 

转载于:https://www.cnblogs.com/cuizhf/p/4329301.html