Any differences between asInstanceOf[X] and toX for value types?

Question

I used IntelliJ\'s ability to convert Java code to Scala code which generally works quite well.

It seems that IntelliJ replaced all casts with calls to asInstanceO

Answer 1

Well, toInt and toLong are not casts. The correct conversion of type casting is asInstanceOf indeed. For example:

scala> val x: Any = 5
x: Any = 5

scala> if (x.isInstanceOf[Int]) x.asInstanceOf[Int] + 1
res6: AnyVal = 6

scala> if (x.isInstanceOf[Int]) x.toInt + 1
:8: error: value toInt is not a member of Any
       if (x.isInstanceOf[Int]) x.toInt + 1
                                  ^