scala read / write from compressed gz

gz.scala

import java.io._
import java.util.zip._
import scala.io.Source

var in   = new GZIPInputStream(new FileInputStream("test.gz"))
// write setup in different objects to close later properly (important for big files )
var fos  = new FileOutputStream("test2.gz")
var gzos = new GZIPOutputStream( fos )
var w    = new PrintWriter(gzos)
for (line <- Source.fromInputStream(in).getLines()) {
        println(line)
        w.write(line+"\n")
}
w.close()
gzos.close()
fos.close()