@startuml
package com.iluwatar.command {
  class App {
    + App()
    + main(args : String[]) {static}
  }
  class Goblin {
    + Goblin()
    + toString() : String
    + changeSize()
    + changeVisibility()
  }
  enum Size {
    + NORMAL {static}
    + SMALL {static}
    - title : String
    + toString() : String
    + valueOf(name : String) : Size {static}
    + values() : Size[] {static}
  }
  abstract class Target {
    - LOGGER : Logger {static}
    - size : Size
    - visibility : Visibility
    + Target()
    + getSize() : Size
    + getVisibility() : Visibility
    + printStatus()
    + setSize(size : Size)
    + setVisibility(visibility : Visibility)
    + toString() : String {abstract}
  }
  enum Visibility {
    + INVISIBLE {static}
    + VISIBLE {static}
    - title : String
    + toString() : String
    + valueOf(name : String) : Visibility {static}
    + values() : Visibility[] {static}
  }
  class Wizard {
    - LOGGER : Logger {static}
    - redoStack : Deque<Runnable>
    - undoStack : Deque<Runnable>
    + Wizard()
    + castSpell(Runnable : runnable)
    + redoLastSpell()
    + toString() : String
    + undoLastSpell()
  }
}
Target -->  "-size" Size
Wizard -->  "-changeSize" Goblin
Wizard -->  "-changeVisibility" Goblin
Target -->  "-visibility" Visibility
Goblin --|> Target
App --> "castSpell" Wizard
@enduml