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Scala example source code file (arrays.scala)

This example Scala source code file (arrays.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

array, array, generic, generic, spec, spec, t, t, test

The Scala arrays.scala source code




import runtime.ScalaRunTime._


class Generic[T](a: Array[T]) {
  def apply() = a(0)
}


class Spec[@specialized(AnyRef) T](a: Array[T]) {
  def apply() = a(0)
}


object Test {
  
  def main(args: Array[String]) {
    val len = 50
    
    testSpec(new Array[String](len))
    println(arrayApplyCount)
    
    (new Spec(new Array[String](len)))()
    println(arrayApplyCount)
    
    testGeneric(new Array[String](len))
    println(arrayApplyCount)
    
    (new Generic(new Array[String](len)))()
    println(arrayApplyCount)
  }
  
  def testGeneric[T](a: Array[T]) = {
    var i = 0
    var sum = 0
    while (i < a.length) {
      sum += (if (a(i) != null) 1 else 0)
      i += 1
    }
    sum
  }
  
  def testSpec[@specialized(AnyRef) T](a: Array[T]) = {
    var i = 0
    var sum = 0
    while (i < a.length) {
      sum += (if (a(i) != null) 1 else 0)
      i += 1
    }
    sum
  }
  
}

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