Scala example source code file (caseClassEquality.scala)

This example Scala source code file (caseClassEquality.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, c1, c1, c2, c2, c3, c3, cs1, cs2, h1, h2, int, int, seq

The Scala caseClassEquality.scala source code

object Test {
  abstract class A1
  case class C1(x: Int) extends A1
  class C2(x: Int) extends C1(x) {
    override def productPrefix = "Shazbot!"
  }
  class C3(x: Int) extends C1(x) {
    override def canEqual(other: Any) = other.isInstanceOf[C3]
    override def equals(other: Any) = other match {
      case ob: C3 => x == ob.x
      case _      => false
    }
  }
  
  case class CS1(xs: Any*)
  class CS2(xs: Seq[_]*) extends CS1(xs: _*)
  class CS3(xs: IndexedSeq[Int]*) extends CS2(xs: _*)
  
  case class H1(x: Int, y: Double)
  class H2(x: Double, y: Int) extends H1(y, x)
  
  def main(args: Array[String]): Unit = {
    assert(C1(5) == new C2(5))
    assert(new C2(5) == C1(5))
    assert(C1(5).hashCode == new C2(5).hashCode)
    assert(new C2(5).hashCode == C1(5).hashCode)
  
    assert(C1(5) != new C3(5))
    assert(new C3(5) != C1(5))
    
    assert(CS1(List(1d,2d), Seq[Float](3f, 4f)) == new CS3(IndexedSeq(1,2), IndexedSeq(3, 4)))
    
    assert(H1(5, 10d) == new H2(10d, 5))
    assert(H1(5, 10d).hashCode == new H2(10d, 5).hashCode)
  }
}