Comparator 排序报 空指针异常

        List<User> userList = new ArrayList<>();
        userList.sort(Comparator.comparing(User::getEmployeeId)) ;

当列表中含有学号为空的元素时，会报空指针异常，

可采用

Comparator.nullsLast(String::compareTo)

解决元素的值为空的问题

结果为

userList.sort(Comparator.comparing(User::getEmployeeId, Comparator.nullsLast(String::compareTo)));

标签：String,getEmployeeId,comparing,userList,User,Comparator,排序,指针
来源： https://www.cnblogs.com/HS-WXL/p/11956910.html