Lambda: IntPredicate avoids boxing for a primitive int test

IntPredicate takes a primitive int directly, so testing many integers avoids the autoboxing overhead a Predicate<Integer> would incur on every call.

Code

IntPredicate isEven = n -> n % 2 == 0;
System.out.println("isEven(4): " + isEven.test(4));
System.out.println("isEven(7): " + isEven.test(7));

Output

isEven(4): true
isEven(7): false