@startuml
Director *-> Builder
Builder <|-- ConcreteBuilder
ConcreteBuilder .> Product
Director <-- Client
Client -> ConcreteBuilder

class Director {
  +Director(Builder&)
  +Construct()
}
interface Builder {
  {abstract} +BuildPartA()
  +BuildPartB()
}
class ConcreteBuilder {
  +BuildPartA()
  +BuildPartB()
  +GetProduct() : Product
}

hide empty attributes
hide empty methods
@enduml