@Override
 public int hashCode() {
   final int prime = 31;
   int result = 1;
   result = prime * result + (active ? 1231 : 1237);
   result = prime * result + customerId;
   result = prime * result + ((firstName == null) ? 0 : firstName.hashCode());
   result = prime * result + ((lastName == null) ? 0 : lastName.hashCode());
   result = prime * result + ((paddress == null) ? 0 : paddress.hashCode());
   result = prime * result + ((store == null) ? 0 : store.hashCode());
   return result;
 }
 @Override
 public boolean equals(Object obj) {
   if (this == obj) return true;
   if (obj == null) return false;
   if (getClass() != obj.getClass()) return false;
   Customer other = (Customer) obj;
   if (active != other.active) return false;
   if (customerId != other.customerId) return false;
   if (firstName == null) {
     if (other.firstName != null) return false;
   } else if (!firstName.equals(other.firstName)) return false;
   if (lastName == null) {
     if (other.lastName != null) return false;
   } else if (!lastName.equals(other.lastName)) return false;
   if (paddress == null) {
     if (other.paddress != null) return false;
   } else if (!paddress.equals(other.paddress)) return false;
   if (store == null) {
     if (other.store != null) return false;
   } else if (!store.equals(other.store)) return false;
   return true;
 }
  public Store removeStore(Store store) {
    getStores().remove(store);
    store.setStaff(null);

    return store;
  }
  public Store addStore(Store store) {
    getStores().add(store);
    store.setStaff(this);

    return store;
  }