Scala

case class Lunch(customer: Customer, employee: Employee) {
  def order(foodName: String) =
    this.customer.placeOrder(foodName, employee)

  def result() = this.customer.printFood()
}

case class Customer(var food: Food) {
  def placeOrder(foodName: String, employee: Employee) =
    this.food = employee.takeOrder(foodName)

  def printFood(): Unit = System.out.println(this.food.name)
}

class Employee {
  def takeOrder(foodName: String): Food = Food(foodName)
}

case class Food(name: String)