How to use Comparator in Java to sort

Question

I learned how to use the comparable but I\'m having difficulty with the Comparator. I am having a error in my code:

Exception in thread \"main\" java.lang.C         


        

Answer 1

Here's a super short template to do the sorting right away :

Collections.sort(people,new Comparator(){
   @Override
   public int compare(final Person lhs,Person rhs) {
     //TODO return 1 if rhs should be before lhs 
     //     return -1 if lhs should be before rhs
     //     return 0 otherwise (meaning the order stays the same)
     }
 });

if it's hard to remember, try to just remember that it's similar (in terms of the sign of the number) to:

 lhs-rhs 

That's in case you want to sort in ascending order : from smallest number to largest number.