code: public StartExportTaskRequest withExportDataFormat(String... exportDataFormat) {
          if (this.exportDataFormat == null) {
              setExportDataFormat(new java.util.ArrayList<String>(exportDataFormat.length));
          }
          for (String ele : exportDataFormat) {
              this.exportDataFormat.add(ele);
          }
          return this;
      }
docs: <p>
  The file format for the returned export data. Default value is <code>CSV</code>. <b>Note:</b> <i>The</i>
  <code>GRAPHML</code> <i>option has been deprecated.</i>
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setExportDataFormat(java.util.Collection)} or {@link #withExportDataFormat(java.util.Collection)} if you
  want to override the existing values.
  </p>
  
  @param exportDataFormat
  The file format for the returned export data. Default value is <code>CSV</code>. <b>Note:</b> <i>The</i>
  <code>GRAPHML</code> <i>option has been deprecated.</i>
  @return Returns a reference to this object so that method calls can be chained together.
  @see ExportDataFormat