[英]How to remove the index out of bound error in my program?
我嘗試了各種方法來通過更改數組的上限來消除索引錯誤,但是錯誤仍然存在。 我要去哪里錯了?
我的程序讀取Excel工作表第一列中的值(所有行)並找到最大值。 然后根據最大值制定標准,並將這些值分類為“低”,“中”,“高”,然后寫回到新的Excel工作表中。
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
}
它看起來不是一個非常復雜的問題。 索引超出范圍意味着您正在嘗試訪問數組中不存在的位置。 注意您的numbusarray
變量,可能row
被設置為無效索引。
這是因為您的sh Sheet.class對象沒有具有column = 4的單元格。這應該可以解決它:
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());
}
最后編輯:
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);
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