—
根据bavatar去重复
:
rightsCouponList.stream().collect(Collectors.collectingAndThen(Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(RightsCoupon::getBavatar))), ArrayList::new));
—
按照RightsCoupon里面的bavatar倒叙排列
:
rightsCouponList.stream().sorted(Comparator.comparing(RightsCoupon::getBavatar).reversed()).collect(Collectors.toList());
—
取前三条数据
:
—
正序排列:由小到大
—
按照RightsCoupon里面的bavatar倒叙排列并且取出前三条数据
rightsCouponList.stream().sorted(Comparator.comparing(RightsCoupon::getBavatar).reversed()).limit(3).collect(Collectors.toList());
–按照距离排列和空/Null数据排序 并且取出前20条数据 nullsLast:null放后面
shopDTOList.stream().sorted(Comparator.comparing(CompanyShopDTO::getDistanceNum, Comparator.nullsLast(Long::compareTo))).limit(20).collect(Collectors.toList());
—
需要正序排列去掉.reversed()
rightsCouponList.stream().sorted(Comparator.comparing(RightsCoupon::getBavatar)).limit(3).collect(Collectors.toList());
—
获取某个属性List(bavatar)
:
rightsCouponList.stream().map(it -> it.getBavatar()).collect(Collectors.toList());
—
排序 status顺序 createTime 顺序
Collections.sort(myRedpackDtoList
,Comparator.comparing(
MyRedpackDto
::
getStatus
).thenComparing(
MyRedpack
::getCreateTime));
—
排序 status降序 createTime 降序
myRedpackDtoList.stream().sorted(Comparator.comparing(MyRedpackDto::getStatus).reversed().thenComparing(MyRedpack::getCreateTime).reversed());
Collections.sort(myRedpackDtoList
,Comparator.comparing(
MyRedpackDto
::
getStatus)
.reversed()
.thenComparing(MyRedpack::getCreateTime)
.reversed()
);
—
按指定字段移除
myRedpackDtoList.removeIf(m -> m.getStatus().contains(“a”));
— 把为空的数据进行过滤掉
List<TbLaborer> laborerList = tbLaborerList.stream().filter((TbLaborer p) -> StringUtils.isNotEmpty(p.getDeviceCode())).map(p -> p).collect(Collectors.toList());
List<String> deviceCodes = tbLaborerList.stream().filter((TbLaborer p) -> StringUtils.isNotEmpty(p.getDeviceCode())).map(p -> p.getDeviceCode()).collect(Collectors.toList());