@startuml
Client -right-> Abstraction
Abstraction <|-- RefinedAbstraction
Abstraction o-right-> Implementor
Implementor <|-- ConcreteImplementorA
Implementor <|-- ConcreteImplementorB

class Abstraction {
  -anImplementor : Implementor*
  +Request()
}
interface Implementor {
  {abstract} +RequestImpl()
}
class ConcreteImplementorA {
  +RequestImpl()
}
class ConcreteImplementorB {
  +RequestImpl()
}

hide empty attributes
hide empty methods
@enduml