Question

我已经尝试了通过更改数组的上限来删除索引超出绑定错误的各种方法。但错误仍然存在。我哪里错了？

我的程序读取Excel工作表第一列中的值（所有行）并找到最大值。然后根据最大值，制定标准，并将值分类为低，中，高，并写回新的Excel表。

import java.io.FileInputStream;
import java.io.IOException;
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
import java.io.*;
import java.util.*;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.Label;
import jxl.write.WriteException;

public class Bus3{

List<String> numbusarray = new ArrayList<String>();
List<String> numcommutersarray = new ArrayList<String>();
List<String> numcommercialarray = new ArrayList<String>();
    static WritableWorkbook workbook;
        static WritableSheet wSheet;


public void readExcel() throws BiffException, IOException, WriteException//method to read       contents form excel
{
    String FilePath = "Bus1.xls";
    Scanner sc = new Scanner(System.in);
    int max=0;

    FileInputStream fs = new FileInputStream(FilePath);
    Workbook wb = Workbook.getWorkbook(fs);
    Sheet sh = wb.getSheet("Bus1");// TO get the access to the sheet
    int totalNoOfRows = sh.getRows();// To get the number of rows present in  sheet
    int totalNoOfCols = sh.getColumns();// To get the number of columns present in sheet
    System.out.println(totalNoOfRows);
    //adding excel contents from every column to arraylist
    for (int row = 1; row <totalNoOfRows; row++)
    {
        numbusarray.add(sh.getCell(2, row).getContents());
    }


    for (int row = 1; row <totalNoOfRows; row++)
    {
        numcommutersarray.add(sh.getCell(3, row).getContents());
    }

    for (int row = 1; row <totalNoOfRows; row++)
    {
        numcommercialarray.add(sh.getCell(4, row).getContents());
    }
    //to find maximum of numbusarray
    max=Integer.parseInt(numbusarray.get(0));
    for (int row = 1; row < totalNoOfRows-1; row++)
    {   
               if(!(numbusarray.get(row)).isEmpty())
               {
               int intNumber=Integer.parseInt(numbusarray.get(row));
               if(intNumber>max)
               {
                max=intNumber;
                //System.out.println(max);
               }
               }


    }
    System.out.println(max);
    WritableWorkbook workbook = Workbook.createWorkbook(new File("sampletestfile.xls"));
    WritableSheet wSheet = workbook.getSheet(0);
    int increment=max/3;
    int a=increment;
    int b=a+increment;
    int c=b+increment;
    for (int row = 0; row < totalNoOfRows-1; row++)
    {   
               if(!(numbusarray.get(row)).isEmpty())
               {
               int compare=Integer.parseInt(numbusarray.get(row));
               if(compare<=a)
               {Label label= new Label(0, row, "Low");//column,row,strngdata
               wSheet.addCell(label);}
               else if((compare>a)&&(compare<=b))
               {Label label= new Label(0, row, "Medium");//column,row,strngdata
               wSheet.addCell(label);}
               else
               {Label label= new Label(0, row, "High");//column,row,strngdata
               wSheet.addCell(label);}
               }
    }              
 /*Iterator itr=numbusarray.iterator(); //to print arraylist demo 
    while(itr.hasNext()){  
        System.out.println(itr.next());  
    }*/
    }//end of method to read contents from excel   
    //to close file
    public static void closeFile()
    {
        try {
            // Closing the writable work book
            workbook.write();
            workbook.close();

            // Closing the original work book
        } catch (Exception e)

        {
            e.printStackTrace();
        }
    }


    public static void main(String args[]) throws BiffException, IOException, WriteException  //main class
    {
        Bus3 DT = new Bus3();
        DT.readExcel();
        Bus3.closeFile();
    }//end of main class

}

Answer 1

它看起来不是一个非常复杂的问题。索引越界意味着您正在尝试访问阵列中不存在的位置。观看您的numbusarray变量，可能row被设置为无效索引。

Answer 2

这是因为你的sh Sheet.class对象没有column = 4的单元格。这应该解决它：

    for (int row = 1; row < totalNoOfRows; row++) {
        numbusarray.add(sh.getCell(1, row).getContents());
    }

    for (int row = 1; row < totalNoOfRows; row++) {
        numcommutersarray.add(sh.getCell(2, row).getContents());
    }

    for (int row = 1; row < totalNoOfRows; row++) {
        numcommercialarray.add(sh.getCell(3, row).getContents());
    }

最后编辑：

    for (int row = 1; row < totalNoOfRows; row++) {
        numbusarray.add(sh.getCell(1, row).getContents());
    }

    for (int row = 1; row < totalNoOfRows; row++) {
        numcommutersarray.add(sh.getCell(2, row).getContents());

    }

    for (int row = 1; row < totalNoOfRows; row++) {
        numcommercialarray.add(sh.getCell(3, row).getContents());
    }
    // to find maximum of numbusarray
    max = 0;
    for (int row = 1; row < totalNoOfRows; row++) {
        if (!(numbusarray.get(row - 1)).isEmpty()) {
            int intNumber = Integer.parseInt(numbusarray.get(row - 1));
            if (intNumber > max) {
                max = intNumber;
                System.out.println("max: " + max);
            }
        }

    }
    System.out.println(max);
    workbook = Workbook.createWorkbook(new File("sampletestfile.xls"));
    WritableSheet wSheet = workbook.createSheet("name", 0);

如何在我的程序中删除索引超出范围的错误？

2 个答案: