Scala example source code file (equality.scala)

This example Scala source code file (equality.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, double, int, list, list, nil, nil, test, test, unit

The Scala equality.scala source code

// a quickly assembled test of equality.  Needs work.
object Test
{
  import scala.runtime.ScalaRunTime.hash
  
  def makeFromInt(x: Int) = List(
    x.toByte, x.toShort, x.toInt, x.toLong, x.toFloat, x.toDouble, BigInt(x), BigDecimal(x)
  ) ::: (
    if (x < 0) Nil else List(x.toChar)
  )
  def makeFromDouble(x: Double) = List(
    x.toShort, x.toInt, x.toLong, x.toFloat, x.toDouble, BigInt(x.toInt), BigDecimal(x)
  )
  
  def main(args: Array[String]): Unit = {
    var xs = makeFromInt(5)
    for (x <- xs ; y <- xs) {
      assert(x == y, x + " == " + y)
      assert(hash(x) == hash(y), "hash(%s) == hash(%s)".format(x, y))
    }
    
    xs = makeFromInt(-5)
    for (x <- xs ; y <- xs) {
      assert(x == y, x + " == " + y)
      assert(hash(x) == hash(y), "hash(%s) == hash(%s)".format(x, y))
    }
    
    xs = makeFromDouble(500.0)
    for (x <- xs ; y <- xs) {
      assert(x == y, x + " == " + y)
      assert(hash(x) == hash(y), "hash(%s) == hash(%s)".format(x, y))
    }
    
    // negatives
    val bigLong = new java.util.concurrent.atomic.AtomicLong(Long.MaxValue)
    assert(-1 != bigLong && bigLong != -1)  // bigLong.intValue() == -1
    assert(BigDecimal(1.1) != 1L)
    assert(1L != BigDecimal(1.1))
  }
}