java中的非法转发引用 [英] illegal forward reference in java

问题描述

 import java.io.*;
 import jxl.*;
 class Xlparsing
 {
   Workbook wb =wb.getWorkbook(new File(
    "C:\\Documents and Settings\\kmoorthi\\Desktop\\ak\\new.xls"));
   // Illegal forward reference What it means
   Sheet st = wb.getSheet(0);
   Cell cell1 = st.getCell(0,0);
   String a1 = cell1.getContents();
   public static void main(String s[])
   {
     System.out.println(new Xlparsing().a1);
   }
 }

嗨当我试图从excel表中提取数据时非法转发引用错误来自文件对象创建。

Hi When I tried to extract data from excel sheet illegal forward reference error comes in the file object creation.

如何解决此问题？

推荐答案

非法转发引用表示您在定义变量之前尝试使用它。

"Illegal forward reference" means that you are trying to use a variable before it is defined.

在这种情况下，您试图在 wb 上的方法> wb 。

In this case, you are trying to invoke a method on wb in the declaration of wb.

Workbook wb = wb.getWorkbook(...);

这篇关于java中的非法转发引用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！