return new HashCodeBuilder(17, 37). append(this.getId()). toHashCode(); }
return new HashCodeBuilder(17, 37) .append(this.getSubsystemId()) .append(this.getId()) .toHashCode(); }
  public int hashCode()  {    // you pick a hard-coded, randomly chosen, non-zero, odd number    // ideally different for each class    return new HashCodeBuilder(17, 37).          append(this.getId()).       toHashCode();   }