Comparator - int cannot be dereferenced

Question

So I saw an example on here how to sort an ArrayList using the Comparator interface, so I tried it out. With Strings it worked perfectly, but with one variable that I want to so

Answer 1

You can't call methods on ints; there's no compareTo method to call. That would be on the boxed Integer type, but boxing would be overkill.

If you're on Java 7+, you should write

return Integer.compare(o1.getScore(), o2.getScore());

...otherwise you'll more or less need to write

if (o1.getScore() < o2.getScore()) {
   return -1;
} else if (o1.getScore() > o2.getScore()) {
   return 1;
} else {
   return 0;
}