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Scala example source code file (Nothing.scala)

This example Scala source code file (Nothing.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

nothing, nothing

The Scala Nothing.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2002-2010, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

package scala

/** `Nothing` is - together with [[scala.Null]] - at the bottom of Scala's type hierarchy.
 *  
 *  `Nothing` is a subtype of every other type (including [[scala.Null]]); there exist 
 *  ''no instances'' of this type.  Although type `Nothing` is uninhabited, it is
 *  nevertheless useful in several ways.  For instance, the Scala library defines a value
 *  [[scala.collection.immutable.Nil]] of type `List[Nothing]`. Because lists are covariant in Scala,
 *  this makes [[scala.collection.immutable.Nil]] an instance of `List[T]`, for any element of type `T`.
 *
 *  Another usage for Nothing is the return type for methods which never return normally.
 *  One example is method error in [[scala.sys]], which always throws an exception.
 */
sealed trait Nothing

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