code: public DescribeExportTasksResult withExportTasks(ExportTask... exportTasks) {
          if (this.exportTasks == null) {
              setExportTasks(new com.amazonaws.internal.SdkInternalList<ExportTask>(exportTasks.length));
          }
          for (ExportTask ele : exportTasks) {
              this.exportTasks.add(ele);
          }
          return this;
      }
docs: <p>
  The export tasks.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setExportTasks(java.util.Collection)} or {@link #withExportTasks(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param exportTasks
  The export tasks.
  @return Returns a reference to this object so that method calls can be chained together.