Scala example source code file (numbereq.scala)

This example Scala source code file (numbereq.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, bigdecimal, bigdecimal, bigint, int, list, list, nil, nil, test, test, unit

The Scala numbereq.scala source code

object Test {
  def mkNumbers(x: Int): List[AnyRef] = {
    val base = List(
      BigDecimal(x),
      BigInt(x),
      new java.lang.Double(x.toDouble),
      new java.lang.Float(x.toFloat),
      new java.lang.Long(x.toLong),
      new java.lang.Integer(x)
    )
    val extras = List(
      if (x >= Short.MinValue && x <= Short.MaxValue) List(new java.lang.Short(x.toShort)) else Nil,
      if (x >= Byte.MinValue && x <= Byte.MaxValue) List(new java.lang.Byte(x.toByte)) else Nil,
      if (x >= Char.MinValue && x <= Char.MaxValue) List(new java.lang.Character(x.toChar)) else Nil
    ).flatten
    
    base ::: extras
  }
      
  
  def main(args: Array[String]): Unit = {
    val ints    = (0 to 15).toList map (Short.MinValue >> _)
    val ints2   = ints map (x => -x)
    val ints3   = ints map (_ + 1)
    val ints4   = ints2 map (_ - 1)
    
    val setneg1 = ints map mkNumbers
    val setneg2 = ints3 map mkNumbers
    val setpos1 = ints2 map mkNumbers
    val setpos2 = ints4 map mkNumbers
    val zero = mkNumbers(0)
    
    val sets = setneg1 ++ setneg2 ++ List(zero) ++ setpos1 ++ setpos2    
    
    for (set <- sets ; x <- set ; y <- set) {
      // println("'%s' == '%s' (%s == %s) (%s == %s)".format(x, y, x.hashCode, y.hashCode, x.##, y.##))
      assert(x == y, "%s/%s != %s/%s".format(x, x.getClass, y, y.getClass))
      assert(x.## == y.##, "%s != %s".format(x.getClass, y.getClass))
    }
  }
}