方法一:
List<NursingHandover> testList = list.stream().collect(Collectors.collectingAndThen(Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(o -> o.getj() + ";" + o.getName() + ";"))), ArrayList::new));
方法二:
Map<Long, String> newMap = list.stream().collect(Collectors.toMap(NursingHandover::getSj, NursingHandover::getName));
方式三:
Map<Object, List<NursingHandover>> costLmmMap = list.parallelStream().collect(Collectors.groupingBy(item -> (item.getSj() +"_" + item.getName()), Collectors.toList()));