Why can I cast null to String, but not Int?

[Oliver Ruebenacker]

Hello,

Why is casting null to String any different from casting null to Int?

scala> null
res11: Null = null

scala> null : String
res12: String = null

scala> null : Int
<console>:8: error: type mismatch;
found : Null(null)
required: Int
Note that implicit conversions are not applicable because they are ambiguous:
both method Integer2intNullConflict in class LowPriorityImplicits of
type (x: Null)Int
and method Integer2int in object Predef of type (x: Integer)Int
are possible conversion functions from Null(null) to Int
null : Int
^

Thanks!

Take care
Oliver

--
IT Project Lead at PanGenX (http://www.pangenx.com)
The purpose is always improvement

[Peter Salanki]

Int is a primitive and can't be null.

http://stackoverflow.com/questions/2254435/can-an-int-be-null-in-java

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[Oliver Ruebenacker]

Oh, I got it. null is of type Null, which is sub-class of AnyRef, but
not AnyVal.