list.stream().collect(Collectors.groupingBy(f-> Arrays.asList(f.getField1(),f.getField2()) ,Collectors.summingInt(f->1)));
java list stream多字段分组求和示例
最新推荐文章于 2025-03-28 17:27:21 发布
list.stream().collect(Collectors.groupingBy(f-> Arrays.asList(f.getField1(),f.getField2()) ,Collectors.summingInt(f->1)));