Scala example source code file (unapplyComplex.scala)

This example Scala source code file (unapplyComplex.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

any, complex, complexpolar, complexpolar, complexrect, complexrect, double, double, komplex, option, product2, some, some, test

The Scala unapplyComplex.scala source code

trait Complex extends Product2[Double, Double] {
  def canEqual(other: Any) = other.isInstanceOf[Complex]
}

class ComplexRect(val _1: Double, val _2: Double) extends Complex {
  override def toString = "ComplexRect("+_1+","+_2+")"
}

class ComplexPolar(val _1: Double, val _2: Double) extends Complex {
  override def toString = "ComplexPolar("+_1+","+_2+")"
}

object ComplexRect {
  def unapply(z:Complex): Option[Complex] = {
    if(z.isInstanceOf[ComplexRect]) Some(z) else z match {
      case ComplexPolar(mod, arg) =>
	Some(new ComplexRect(mod*Math.cos(arg), mod*Math.sin(arg)))
} } }

object ComplexPolar {
  def unapply(z:Complex): Option[Complex] = {
    if(z.isInstanceOf[ComplexPolar]) Some(z) else z match {
      case ComplexRect(re,im) =>
	Some(new ComplexPolar(Math.sqrt(re*re + im*im), Math.atan(re/im)))
} } }

object Test {
  def main(args:Array[String]) = {
    new ComplexRect(1,1) match {
      case ComplexPolar(mod,arg) => // z @ ???
	Console.println("mod"+mod+"arg"+arg)
    }
    val Komplex = ComplexRect
    new ComplexPolar(Math.sqrt(2),Math.Pi / 4.0) match {
      case Komplex(re,im) => // z @ ???
	Console.println("re"+re+" im"+im)
    }
  }
}