how to import a class in scala

Question

I am learning scala recently, the package in scala confused me.

I have a file named StockPriceFinder.scala:

// StockPriceFinder.scala
object StockPriceFinder {
    def getTickersAndUnits() = {
        val stockAndUnitsXML = scala.xml.XML.load("stocks.xml")

        (Map[String, Int]() /: (stocksAndUnitsXML \ "symbol")) {
            (map, symbolNode) => 
                val ticker = (symbolNode \ "@ticker").toString
                val units = (symbolNode \ "units").text.toInt
                map ++ Map(ticker -> units)
        }
    }
}

then I want to use StockPriceFinder in test.scala which is in the same folder:

val symbolAndUnits = StockPriceFinder.getTickersAndUnits

but when I run it with scala test.scala, I got error:error: not found: value StockPriceFinder. In Java, if this two source files are in the same folder, I do not need to import and I can use it directly, so how can I import StockPriceFinder correctly in scala?

I have tried to use import StockPriceFinder in test.scala, but it still does not work.

@LionelPort I have tried to use import StockPriceFinder in test.scala, but it still does not work — roger
– roger, Commented Mar 20, 2015 at 5:38

Alexey Romanov · Accepted Answer · 2015-03-20 06:12:45Z

3

You don't need to import StockPriceFinder if the files are in the same package (not folder).

But you do need to compile StockPriceFinder.scala first and pass the correct classpath to scala.

scalac StockPriceFinder.scala
scala -cp . test.scala

should work (might be a bit off). However, you shouldn't do it manually, since it becomes unmanageable very quickly; use SBT or other build tools (Maven, Gradle).

answered Mar 20, 2015 at 6:12

Alexey Romanov

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2 Comments

roger Over a year ago

if I do not need StockPriceFinder, I just use scala test.scala it will run normally without compiling. So if I need to compile the file if I refer this file in some other place?

Alexey Romanov Over a year ago

It doesn't "run without compiling", scala just takes care of compiling it for you. But it doesn't know where it should get StockPriceFinder from.

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