ShoppingBasketWithoutState.java

public static class ShoppingBasket1 {
     private String orderNo;
     private List<String> articleNumbers = new ArrayList<>();
     public void add(String articleNumber) {
         articleNumbers.add(articleNumber);
     }
     public String getOrderNo() {
         return orderNo;
     }
     public void setOrderNo(String orderNo) {
         this.orderNo = orderNo;
     }
     public void order() {
         // some ordering logic and if succeeded, change state
     }
 }