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

WashingMachine.java

class WashingMachine {
    private Programme programme;
    private Laundry laundry;

    void selectProgramme(Programme programme) {
        this.programme = programme;
    }

    Laundry takeOutLaundry() {
        return laundry;
    }

    void addLaundry(Laundry laundry) {
        this.laundry = laundry;
    }

    void start() {
        laundry.asList().forEach(laundryElement -> laundryElement.clean());
    }
}