public EventBasedExcelExtractor(POIFSFileSystem fs) {this(fs.getRoot());super.setFilesystem(fs);}

public EventBasedExcelExtractor ( POIFSFileSystem fs ) { this ( fs . getRoot ( ) ) ; super . setFilesystem ( fs ) ; }
public EventBasedExcelExtractor(POIFSFileSystem fs): base(null){this.fs = fs;}
