Scala example source code file (bug3530.scala)

This example Scala source code file (bug3530.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, any, array, array, list, list, test, test

The Scala bug3530.scala source code

object Test {
  def f(x: Any) = println(x match {
    case List(_, _)    => "two"
    case List(_, _, _) => "three"
    case xs @ List(_*) => "list: " + xs.length
    case _             => "not a list"
  })
  
  def f2[T](x: List[T]) = println(x match {
    case List(_, _)       => "two"
    case List(_, _, _)    => "three"
    case List(xs @ _*)    => "list: " + xs.length
    // bug: the default case is marked unreachable
    // case _                => "not a list"
  })

  def main(args: Array[String]) {
    f(List(1, 2))
    f(List('a', 'b', 'c'))
    f(List('a', 'b', 'c', 'd'))
    f(Nil)
    f(List(1,2,3,4,5))
    f(null)
    
    println
    
    f2(List(1, 2))
    f2(List('a', 'b', 'c'))
    f2(List('a', 'b', 'c', 'd'))
    f2(Nil)
    f2(List(1,2,3,4,5))
    // bug: this NPEs on xs.length
    // f2(null)
  }
}