How to use trim and avoid NPE by using collections.sort?

Question

There is a Class Role, having data member as String roleName. I have to sort a list of Role. While sorting I need to check NPE and trim roleName also. So I used

roleList.sort(Comparator.comparing(Role::getRoleName, 
    Comparator.nullsLast(Comparator.naturalOrder())));

I can suppress the null pointer exception but can't use trim.

roleList.sort( (x, y) -> x.getRole().trim().compareTo(y.getRole().trim()));

Using this I can't avoid NPE.

Answer 1

How about this:

roleList.sort(Comparator.comparing(Role::getRoleName,
    Comparator.nullsLast(Comparator.comparing(String::trim))));