What's this generics usage in Java? X.method()

Question

I\'ve read the whole SCJP6 book Sierra and Bates book, scored 88% the exam.

But still, i never heard of how this kind of code works as it\'s not explained in the generic

Answer 1

Just a small addition to the other responses.

When getting the according compiler error:

While the "traditional" casting approach

(Comparator) Collections.reverseOrder()

looks similar to the generics approach

Collections.reverseOrder()

the casting approach is of course not type-safe (possible runtime exception), while the generics approach would create a compilation error, if there is an issue. Thus the generics approach is preferred, of course.