平台工具[3]计算机基础编程语言Java

2018-01-22

Java8Stream

List<Vo> results = voList.stream().collect(Collectors.groupingBy(this::fetchKey)).values()
               .stream().map(vo -> vo.stream().reduce((vo1, vo2) -> {
                   vo1.setCount(vo1.getCount() + vo2.getCount());
                   return vo1;
               }).orElse(new Vo())).collect(Collectors.toList());