Scala example source code file (colltest.scala)

This example Scala source code file (colltest.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

app, difference, int, int, iterations, iterations, s0, s1, set, set, string, test, threshold, threshold

The Scala colltest.scala source code

import collection.mutable._
class TestSet(s0: Set[Int], s1: Set[Int]) {
  val Iterations = 10
  val Range = 100000
  val testEachStep = false
  val Threshold = 20000
  val r = new java.util.Random(12345)
  def test(s: Set[Int], n: Int): Any = {
    val v = n >> 3
    n & 7 match {
      case 0 | 1 | 2 => s contains v
      case 3         => s += v
      case 4         => s -= v
      case 5         => if (s.size > Threshold) s -= v else s += v
      case 6         => s += v
      case 7         => s.size
    }
  }
  def explain(n: Int, s: Set[Int]): String = n & 7 match {
    case 0 | 1 | 2 => "contains"
    case 3         => "add"
    case 4         => "remove"
    case 5         => if (s.size > Threshold) "remove" else "add"
    case 6         => "add"
    case 7         => "size"
  }
  def checkSubSet(pre: String, s0: Set[Int], s1: Set[Int]) {
    for (e <- s0.iterator)
      if (!(s1 contains e)) {
        assert(false, pre+" element: "+e+"\n S0 = "+s0+"\n S1 = "+s1)
      }
  }
  for (i <- 0 until Iterations) {
    val n = r.nextInt(Range)
    val res0 = test(s0, n)
    val res1 = test(s1, n)
    //Console.println("operation = "+explain(n, s0)+", value ="+(n >> 3)+", result0 = "+res0)
    if (testEachStep) {
      checkSubSet("superfluous", s0, s1)
      checkSubSet("missing", s1, s0)
    }
    if (res0 != res1)
      assert(false, "DIFFERENCE , operation = "+explain(n, s0)+", value ="+(n >> 3)+
             ", result0 = "+res0+", result1 = "+res1)
  }
  Console.println("succeeded for "+Iterations+" iterations.")
}
object Test extends App {
  def t3954 {
    import scala.collection.mutable
    import scala.collection.immutable
    val result = new mutable.ImmutableSetAdaptor(immutable.ListSet.empty[Int])
    println(result.add(1))
    println(result.add(1))
    val result2 = new mutable.HashSet[Int]
    println(result2.add(1))
    println(result2.add(1))
    val result3 = new java.util.HashSet[Int]()
    println(result3.add(1))
    println(result3.add(1))
  }
  t3954

  new TestSet(HashSet.empty, new scala.collection.mutable.LinkedHashSet)
}