Scala example source code file (lubs.scala)

This example Scala source code file (lubs.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

a, a, c, c, d, null, null, t, t

The Scala lubs.scala source code

object test1 {
  abstract class A[+T]
  class C extends A[C]
  class D extends A[D]

  def f = if(1 == 2) new C else new D

  val x1: A[Any] = f
  val x2: A[A[Any]] = f
  val x3: A[A[A[Any]]] = f
  val x4: A[A[A[A[Any]]]] = f
}

object test2 {

  abstract class A { type T }
  class C extends A { type T = C }
  class D extends A { type T = D }

  def f = if (1 == 2) new C else new D
    
  val x1: A { type T } = f
  val x2: A { type T >: Null <: A } = f
  val x3: A { type T >: Null <: A { type T >: Null <: A } } = f
  val x4: A { type T >: Null <: A { type T >: Null <: A { type T >: Null <: A } } } = f
}