Article: The OOP has been explained wrongly to you - solution

WashingService.java

class WashingService {
    private static final BigDecimal MAX_LAUNDRY_WEIGHT = BigDecimal.valueOf(7);

    Laundry washWool(WashingMachine washingMachine, 
                     Laundry laundry, 
                     Integer spinSpeed, 
                     Integer temperature) {
        Laundry laundryToBeDone = maximumLoadFrom(laundry);
        washingMachine.setLaundry(laundryToBeDone);
        washingMachine.setProgramme(new Programme(temperature, spinSpeed));
        washingMachine.wash();
        return washingMachine.getLaundry();
    }
  
    /* other wash method */
}