Long messageTask = taskResult.stream().filter(e -> e.get("taskTypeId").toString().equals("202")|| e.get("taskTypeId").toString().equals("206"))
.collect(Collectors.summarizingInt(e -> Integer.valueOf(e.get("totalOrderCount").toString()))).getSum();原文：https://www.cnblogs.com/JasonKong/p/11454763.html