code: public void setFiles(java.util.Collection<File> files) {
          if (files == null) {
              this.files = null;
              return;
          }
  
          this.files = new java.util.ArrayList<File>(files);
      }
docs: <p>
  The list of files that exist in the specified folder, if any.
  </p>
  
  @param files
  The list of files that exist in the specified folder, if any.