File download problem in my scala code

Question

I have written the following scala code to download a file . The file gets downloaded correctly but also an exception is thrown. The code is as follows :

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Answer 1

Scala returns type Unit, not the type of the value being assigned, with an assignment statement. So

numRead = in.read(buffer)

never returns -1; it doesn't even return an integer. You can write

while( { numRead = in.read(buffer); numRead != -1 } ) out.write(buffer, 0, numRead)

or you can go for a more functional style with

Iterator.continually(in.read(buffer)).takeWhile(_ != -1).foreach(n => out.write(buffer,0,n))

Personally, I prefer the former since it's shorter (and relies less on iterator evaluation happening the way "it ought to").