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