GNU Free Documentation License . .

Scala ( )

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Scala
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2003
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2.9.2 (14 2012)
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Java, Pizza[1] , Haskell, Erlang, Standard ML, C#, Objective Caml, Smalltalk, Scheme
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www.scala-lang.org

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2003 (. Martin Odersky), Java .Net. (. James Strachan (programmer)), Groovy, Scala Java[2].

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 object HelloWorld {
  def main(args: Array[String]) =
    Console.println(", !")
 }

Java Scala, ( , ). , , . «-» ().

 class PrintOptions
 {
    public static void main(String[] args)
    {
      System.out.println(" :");
      for (String arg: args) if (arg.startsWith("-")) System.out.println(" " + arg.substring(1));
    }
 }

 object PrintOptions
 {
   def main(args: Array[String]) : Unit =
   {
     println(" :")
     for (arg <- args if arg startsWith "-") println(" " + (arg substring 1))
   }
 }

 //    :
 object PrintOptions
 {
   def main(args: Array[String]) : Unit =
     println(" :" +: (args withFilter (_ startsWith "-") map (" " + _.drop(1))) mkString "\n")
 }

, Scala , . , («»  «Singleton»).

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 object Main {
   def main(args: Array[String]) {
     try {
       val elems = args map Integer.parseInt
       println(" : " + elems.foldRight(0) (_ + _))
     } catch {
       case e: NumberFormatException =>
         println("  .   : scala Main <1> <2> ... ")
     }
   }
 }

map . Integer.parseInt () elems. foldRight .

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Scala Java. java.lang , .

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Java Date DateFormat. , , Java :

 import java.util.{Date, Locale}
 import java.text.DateFormat
 import java.text.DateFormat._
 
 object FrenchDate {
   def main(args: Array[String]) {
     val now = new Date
     val df = getDateInstance(LONG, Locale.FRANCE)
     println(df format now)
   }
 }

[] .

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  1. Martin Odersky et al., Programming in Scala, 2nd Edition
  2. Strachan, James Scala as the long term replacement for java/javac? (6  2009). 10 2012. 7 2012.
  3. http://www.scala-lang.org/docu/files/ScalaTutorial.pdf#

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