Scala example source code file (hashCodeDistribution.scala)

This example Scala source code file (hashCodeDistribution.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, c, collision, collision, count, count, int, int, test

The Scala hashCodeDistribution.scala source code

// See ticket #2537.
object Test {
  case class C(x: Int, y: Int) { }
  val COUNT = 300
  val totalCodes = COUNT * COUNT

  def main (args: Array[String]) = {
    val hashCodes =
      for (x <- 0 until COUNT; y <- 0 until COUNT) yield C(x,y).hashCode

    val uniques = hashCodes.distinct
    val collisionRate = (totalCodes - uniques.size) * 1000 / totalCodes

    assert(collisionRate < 5, "Collision rate too high: %d / 1000".format(collisionRate))
    // println("collisionRate = %d / 1000".format(collisionRate))
  }
}