In Java 8 different predicate interfaces (ex. DoublePredicate, LongPredicate, IntPredicate, etc.) are provided. Now if you are going to implement the interface and write your own code in it, what is the advantage of having different predicate interfaces ? why not just one predicate interface ?
The point of these specialized predicate interfaces is to avoid unnecessary auto-(un)boxing when you are working with primitives.
For example, if you need to use a
Predicate that works on
int values you can use
IntPredicate with which you can pass an
int directly to the
test(...) method, instead of a
Predicate<Integer> which requires boxing to an
Note that in Java, it is not possible to use primitive types as type arguments (so,
Predicate<int> is not allowed).