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