Scala example source code file (patterns2.scala)

This example Scala source code file (patterns2.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

choice, choice, none, none, option, option, some, some

The Scala patterns2.scala source code

trait Option {}
case class Choice(a: Option, b: Option) extends Option;
case class Some(x: java.lang.String) extends Option;
case object None extends Option;

object test {

  def f(opt: Option) = opt match {
    case Choice(Some("one"), Some(x)) => 1;
    case Choice(Some("two"), None) => 1;
    case Choice(y, Some("two")) => 2;
    case Choice(Some(z), a) => 3;
    case Some(b) => 4;
    case None => 5;
  }
}