code: public GetFolderResult withSubFolders(Folder... subFolders) {
          if (this.subFolders == null) {
              setSubFolders(new java.util.ArrayList<Folder>(subFolders.length));
          }
          for (Folder ele : subFolders) {
              this.subFolders.add(ele);
          }
          return this;
      }
docs: <p>
  The list of folders that exist beneath the specified folder, if any.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setSubFolders(java.util.Collection)} or {@link #withSubFolders(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param subFolders
  The list of folders that exist beneath the specified folder, if any.
  @return Returns a reference to this object so that method calls can be chained together.