DRAFT
Observed
PrimitiveTypeParameter
Incorrect
Type parameters of generic types can be instantiated with primitive types
Correct
Type parameters of generic types need to be instantiated with reference types
CorrectionHere is what's right.
Here is what's right.
One can only use reference types. Primitive types can’t be used as type arguments.
So, ArrayList<Integer> is ok, but ArrayList<int> is wrong.