code: public void setReservedDBInstances(java.util.Collection<ReservedDBInstance> reservedDBInstances) {
          if (reservedDBInstances == null) {
              this.reservedDBInstances = null;
              return;
          }
  
          this.reservedDBInstances = new com.amazonaws.internal.SdkInternalList<ReservedDBInstance>(reservedDBInstances);
      }
docs: <p>
  A list of reserved DB instances.
  </p>
  
  @param reservedDBInstances
  A list of reserved DB instances.