ArrayIndexout of Bound exception

[Preethi]

java.lang.IndexOutOfBoundsException: Index: 21, Size: 21
at java.util.ArrayList.RangeCheck(ArrayList.java:546)
at java.util.ArrayList.get(ArrayList.java:321)
at saxExamples.DataReader.list(DataReader.java:94)
at saxExamples.DataReader.main(DataReader.java:110)

while excecuting my program i'm getting this exception...How to avoid this and make my program run?

This is my program:

package saxExamples;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import org.xml.sax.SAXException;

public class DataReader 
{
    protected ArrayList<DataObject> res_mseg;
    protected ArrayList<DrawingData> rev_list;
    protected ArrayList<FromDateData> frm_list;
    protected ArrayList<WrkorderData> wrk ;
       
    public DataReader(){
        res_mseg = new ArrayList<DataObject>();
        rev_list = new ArrayList<DrawingData>();
               
    }
    
    public void getData()throws Exception
    {
    
        XMLReading xmlreadingObj = new XMLReading();
        xmlreadingObj.fileParsing("C:/Documents and Settings/Gantt.xml");
        xmlreadingObj.print();
        xmlreadingObj.printDrawingData();
        xmlreadingObj.printFromdate();
        xmlreadingObj.printToDate();
        xmlreadingObj.printToTime();
        xmlreadingObj.printFrmtime();
        
        
    }
    public void list() throws SAXException, FileNotFoundException, IOException, ParseException
    {
      
        XMLReading xmlreadingObj = new XMLReading();
        xmlreadingObj.fileParsing("C:/Documents and Settings/Gantt.xml");
        
        res_mseg = xmlreadingObj.res_list;
        Object [] array = res_mseg.toArray();
        
        rev_list = xmlreadingObj.rev__wrkOrder_list;
        Object [] array1 = rev_list.toArray();
        
        wrk = new ArrayList<WrkorderData>();
        wrk = xmlreadingObj.wrkorder_list;
        
        frm_list = xmlreadingObj.rev_frmdate_list;
                                      
        String str1 = new String();
        String str2 = new String();
        ArrayList<String> list = new ArrayList();
        ArrayList list1 = new ArrayList();
        ArrayList<Date> l = new ArrayList<Date>();
       
        for(int len = 0; len < array.length; len++)
        {
           str1 = array[len].toString();
           for(int len1 = 0; len1 < array1.length; len1++)
           {
               str2 = array1[len1].toString();
               if(str1.compareToIgnoreCase(str2) == 0 )
               {     
                   list.add(frm_list.get(len1).toString());
                   list1.add(wrk.get(len1));
               }
            
            }
           
           for(int wrk_len= 0;wrk_len<wrk.size();wrk_len++)
                   {
                        String str = list.get(wrk_len).toString();
                        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
                        Date date = df.parse(str);
                       
                        l.add(date);
                                                
                   }
            System.out.println(l.get(0).getTime()-l.get(1).getTime());
            list.clear();
          }
    }
       
public static void main(String args[])
    {
        DataReader Obj = new DataReader();
       
        try 
        {
           Obj.list();
            //Obj.getData(); 
        }
        catch (Exception ex) 
        {
            ex.printStackTrace();
        }
    } 

    
   
}

[Eranga]

Error is on one of your arrays, may be adding more data then specified size of it. Better to check it. I'll check it after going home. In this machine I don't have install in JDK :)

[jelly]

I suspect your problem is in this piece of code

           for(int wrk_len= 0;wrk_len<wrk.size();wrk_len++)
                   {
                        String str = list.get(wrk_len).toString();
                        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
                        Date date = df.parse(str);
                       
                        l.add(date);
                                                
                   }

your for loop is limited by the ArrayList wrk:

wrk_len<wrk.size()

but the code inside the loop works on the ArrayList list:

String str = list.get(wrk_len).toString();

I think either the test in the loop is wrong or the ArrayList you are operating on is wrong