public static FileUtil getInstance() {
    if (FileUtil.instance == null) {
      FileUtil.instance = new FileUtil();
    }
    return FileUtil.instance;
  }
public static FileUtil getInstance() {
    if (FileUtil.instance == null) {
      FileUtil.instance = new FileUtil();
    }
    return FileUtil.instance;
  }
public static FileUtil getInstance ( ) { if ( FileUtil . instance == null ) { FileUtil . instance = new FileUtil ( ) ; } return FileUtil . instance ; }
Returns the singleton instance of this class.
<p>

@return the singleton instance of this class.
Returns the singleton instance of this class . <p >