Scala example source code file (unapplySeq.scala)

This example Scala source code file (unapplySeq.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

bar, bar, fooseq, fooseq, int, l, list, list, m, none, none, option, seq

The Scala unapplySeq.scala source code

object FooSeq {
  def unapplySeq(x:Any): Option[Product2[Int,Seq[String]]] = {
    if(x.isInstanceOf[Bar]) {
      val y = x.asInstanceOf[Bar]
      Some(y.size, y.name)
    } else None
  } 

  def main(args:Array[String]) = {
    val b = new Bar
    b match {
      case FooSeq(s:Int,_,n:String) => Console.println("size "+s+" name "+n)
    }
    b.size = 54
    b.name = List("large","L")
    b match {
      case FooSeq(s:Int,_,n:String) => Console.println("size "+s+" name "+n)
    }
  }
}

class Bar {
  var size: Int    = 50
  var name: Seq[String] = List("medium","M")
}