@startuml
Container <|- ConcreteContainer
Iterator <|- ConcreteIterator
ConcreteContainer ..> ConcreteIterator
ConcreteContainer <-- ConcreteIterator

interface Container {
  {abstract} +CreateIterator() : Iterator*
}
interface Iterator {
  {abstract} +First()
  {abstract} +Next()
  {abstract} +Done()
  {abstract} +CurrentItem()
}
class ConcreteContainer {
  +CreateIterator() : ConcreteIterator*
}

hide empty attributes
hide empty methods
@enduml