Article: The OOP has been explained wrongly to you

WashingController.java

class WashingController {
    private final WashingService washingService;

    WashingController(WashingService washingService) {
        this.washingService = washingService;
    }

    void wash(Fabric fabricType) {
        Collection<LaundryElement> laundry = getAllLaundry();
        WashingMachine washingMachine = new WashingMachine();
        if (fabricType == Fabric.WOOL) {
            washingService.washWool(washingMachine, laundry);
        } else if (fabricType == COTTON) {
            washingService.washCotton(washingMachine, laundry);
        } else if (fabricType == SILK) {
            washingService.washSilk(washingMachine, laundry);
        }
    }

    private Collection<LaundryElement> getAllLaundry() {
        Collection<LaundryElement> allLaundry = new ArrayList<>();
        // fill the allLaundry collection with available laundry by any way, 
        // e.g. obtaining it from repositories, providers, services
        return allLaundry;
    }
}