code: public static boolean unpackEntry(File zip, String name, File file) {
      return unpackEntry(zip, name, file, null);
    }
docs: Unpacks a single file from a ZIP archive to a file.
  
  @param zip
  ZIP file.
  @param name
  entry name.
  @param file
  target file to be created or overwritten.
  @return <code>true</code> if the entry was found and unpacked,
  <code>false</code> if the entry was not found.