The method openbrowser() is undefined for the type keywords..how to solve this issue ?

Keywords key= new Keywords();
ArrayList a = new ArrayList(); 
		try{
			
			  FileInputStream inputStream = new FileInputStream(new File("path.xlsxFile"));
		         
		        Workbook workbook = new XSSFWorkbook(inputStream);
		        Sheet firstSheet = workbook.getSheetAt(0);
		        Iterator<Row> iterator = firstSheet.iterator();
		         
		        while (iterator.hasNext()) {
		            Row nextRow = iterator.next();
		            Iterator<Cell> cellIterator = nextRow.cellIterator();
		             
		            while (cellIterator.hasNext()) {
		                Cell cell = cellIterator.next();
		                switch (cell.getCellType()) {
	                    case Cell.CELL_TYPE_STRING:
	                        System.out.print(cell.getStringCellValue());
	                        break;
	                    case Cell.CELL_TYPE_BOOLEAN:
	                        System.out.print(cell.getBooleanCellValue());
	                        break;
	                    case Cell.CELL_TYPE_NUMERIC:
	                        System.out.print(cell.getNumericCellValue());
	                        break;
	                }
	                System.out.print(" - ");
	            }
	            System.out.println();
	        }
	         
	        workbook.close();
	        inputStream.close();
			
for(int i=0;i<a.size();i++){
			if(a.get(i).equals("openbrowser")){
				String keyword = (String)a.get(i);
				String data = (String)a.get(i+1);
				String objectName = (String)a.get(i+2);
				String runmode = (String)a.get(i+3);
				System.out.println(keyword);
				System.out.println(data);
				System.out.println(objectName);
				System.out.println(runmode);
				if(runmode.equals("yes")){
					key.openbrowser();
				}
		 }