问如何通过java检查excel文件中的单元格对于特定的第1个单元格值是否不为空？

EN

for (Row r : sheet) {
   Cell c = r.getCell(0, Row.RETURN_BLANK_AS_NULL);
   if (c == null) {
      // First cell is empty
   } else {
      // First cell has data
      // Count how many of the next 4 cells are filled
      int next4Filled = 0;
      for (int i=1; i<=4; i++) {
         c = r.getCell(i, Row.RETURN_BLANK_AS_NULL);
         if (c != null) next4Filled++;
      }

      if (next4Filled < 2) {
         throw new IllegalStateException("Too many cells empty in row");
      }
   }
}