java stream流实现对list集合去重，根据某一个属性去重，查询重复值操作

list集合去重：

public List<WmsUserExcelVo> repetitionRepetition(List<WmsUserExcelVo> excelListl) {
        List<WmsUserExcelVo> newList = excelListl.stream().distinct().collect(Collectors.toList());
        return newList;
    }

list集合根据某一个属性去重：

public List<WmsMemoryExcelVo> repetitionRepetitions(List<WmsMemoryExcelVo> excelListl) {

        //对list数据 根据某个字段去掉重复数据 这里用的根据vin去除重复值，两个结果相同值去最后一条
        List<WmsMemoryExcelVo> newList = excelListl.stream().collect(Collectors.collectingAndThen
                (Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing
                        (WmsMemoryExcelVo::getVin))), ArrayList::new));
        return newList;
    }

list集合查询重复值：

List<WmsMemoryExcelVo> list = gressionList.stream()
                .collect(Collectors.toMap(e -> e, e -> 1, (a, b) -> a + b))
                .entrySet().stream()
                .filter(entry -> entry.getValue() > 1)
                .map(entry -> entry.getKey())
                .collect(Collectors.toList());