Scala example source code file (t0904.scala)

This example Scala source code file (t0904.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, b, b, foo, int, int, unit, unit

The Scala t0904.scala source code

trait A {
  def apply(x: Int): Int
  def update(x: Int, y: Int): Unit
}

trait B extends A

abstract class Foo {
  val a: A = null
  val b: B = null

  a(0) = 1
  b(0) = 1

  a(0) += 1
  b(0) += 1 // this one does not type check.
}