code: public GetTransitGatewayRouteTablePropagationsResult withTransitGatewayRouteTablePropagations(
              TransitGatewayRouteTablePropagation... transitGatewayRouteTablePropagations) {
          if (this.transitGatewayRouteTablePropagations == null) {
              setTransitGatewayRouteTablePropagations(new com.amazonaws.internal.SdkInternalList<TransitGatewayRouteTablePropagation>(
                      transitGatewayRouteTablePropagations.length));
          }
          for (TransitGatewayRouteTablePropagation ele : transitGatewayRouteTablePropagations) {
              this.transitGatewayRouteTablePropagations.add(ele);
          }
          return this;
      }
docs: <p>
  Information about the route table propagations.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setTransitGatewayRouteTablePropagations(java.util.Collection)} or
  {@link #withTransitGatewayRouteTablePropagations(java.util.Collection)} if you want to override the existing
  values.
  </p>
  
  @param transitGatewayRouteTablePropagations
  Information about the route table propagations.
  @return Returns a reference to this object so that method calls can be chained together.