@startuml
package com.iluwatar.separatedinterface {
  class App {
    - LOGGER : Logger {static}
    + PRODUCT_COST : double {static}
    + App()
    + main(args : String[]) {static}
  }
}
package com.iluwatar.separatedinterface.taxes {
  class DomesticTax {
    + TAX_PERCENTAGE : double {static}
    + DomesticTax()
    + calculate(amount : double) : double
  }
  class ForeignTax {
    + TAX_PERCENTAGE : double {static}
    + ForeignTax()
    + calculate(amount : double) : double
  }
}
package com.iluwatar.separatedinterface.invoice {
  class InvoiceGenerator {
    - amount : double
    - taxCalculator : TaxCalculator
    + InvoiceGenerator(amount : double, taxCalculator : TaxCalculator)
    + getAmountWithTax() : double
  }
  interface TaxCalculator {
    + calculate(double) : double {abstract}
  }
}
InvoiceGenerator -->  "-taxCalculator" TaxCalculator
DomesticTax ..|> TaxCalculator 
ForeignTax ..|> TaxCalculator 
@enduml