Scala example source code file (bug978.scala)

This example Scala source code file (bug978.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, app, app, boolean, boolean, foo, foo, for, int, int, test

The Scala bug978.scala source code

class Foo(val n: Int) {
  override def hashCode = n % 2 // pretty bad hash
  override def equals(other: Any): Boolean = other match {
    case f: Foo => f.n == n
    case _ => false
  }

  override def toString = "" + n
}

object Test extends App {
  val set = new collection.mutable.HashSet[Foo]
//  val set = new collection.jcl.HashSet[Foo]

  val max = 200
  for (x <- 1 to max)
    set += new Foo(x)

  testRemove(2)
  testExists(2)

  def testRemove(m: Int) {
    for (x <- 1 to max; if x % m == 0) {
      val f = new Foo(x)
      set -= f
      assert(!(set contains f))
      testExists(m)
    }
  }

  def testExists(m: Int) {
    for (x <- 1 to max; if x % m == 1) {
      val f = new Foo(x)
      assert(set contains f, "For element: " + f + " set: " + set)
    }
  }

}