单击按钮获取数组列表的值

Question

我想在javafx中单击按钮来显示和使用整数数组列表的值，以便稍后在for循环中使用这些值，但是编译总是会失败。谁能帮忙。 谢谢

public ArrayList SectionNumber() {

    try {
        filename=file_path.getText();
        Excelfile = new FileInputStream(file_path.getText());
        workbook = new XSSFWorkbook(Excelfile);
        XSSFSheet sheet = workbook.getSheetAt(0);
        Iterator<Row> rowIterator = sheet.iterator();
        int row_num =  sheet.getLastRowNum();

    for (int j=11; j<row_num; j++) {       
          if(sheet.getRow(j-1).getCell(0).toString()!="" ) {
            sections.add(j-1);                    
            }             
   }  

    } catch (FileNotFoundException ex) {
        Logger.getLogger(CSV_FXMLDocumentController.class.getName()).log(Level.SEVERE, null, ex);
    } catch (IOException ex) {
        Logger.getLogger(CSV_FXMLDocumentController.class.getName()).log(Level.SEVERE, null, ex);
    }

   return sections; 
}