Unchecked invocation sort

[-]

I have :

Type safety: Unchecked invocation sort(List, Comparator) of the generic
method sort(List<T>, Comparator<? super T>) of type Collections


for this statement:

Collections.sort(list, createComparator());

How can I get rid of the warning?

 

[Sebastian Scheid]

I have :

Type safety: Unchecked invocation sort(List, Comparator) of the generic
method sort(List<T>, Comparator<? super T>) of type Collections


for this statement:

Collections.sort(list, createComparator());

How can I get rid of the warning?

list has to be a List on a type T like List<String> and returntype of
createComparator() has to be a Comparator on the same type T as list (or a
supertype of T), e.g. Comparator<String>.

If you ensure this you won't get any classcast exceptions at runtime (and no
warnings at compiletime of course).

Regards
Sebastian

 

[Roedy Green]

for this statement:

Collections.sort(list, createComparator());

How can I get rid of the warning?

see http://mindprod.com/jgloss/generics.html#COMPARABLE