Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException:

[shankar sunwar]

i am getting this problem while running my program. Please help. The error report points at line no 17.

import java.io.*;

public class Rename{

public static void main(String args[]){
File dir=new File("C:\\irla_ pdf\\eme\\MPS_P dfs_10_2011"); //enter the location where mps pdf files are kept
String [] fname=dir.list( );
if(fname==null)
System.out.prin tln("no files");
else{



for(int i=0;i<dir.lengt h();i++){


File pdffilename=new File("C:\\irla_ pdf\\eme\\MPS_P dfs_10_2011\\"+ fname[i]); //enter the location where mps pdf files are kept

//System.out.prin tln("existing name "+pdffilena me);
String newname=fname[i].substring(11,1 9)+".pdf";
File newfilename=new File("c:\\irla_ pdf\\eme\\pdf10 11\\"+newname);//enter the location where renamed pdf files are to be kept
//System.out.prin tln("new filename "+newfilena me);
if(pdffilename. renameTo(new File("c:\\irla_ pdf\\eme\\pdf10 11\\"+newname)) ){
//System.out.prin tln("renamed");
}
else
System.out.prin tln("error");
//System.out.prin tln(fname[i]);
//System.out.prin tln(newname);



}
}
}
}

[rajujrk]

you fetching the files from the folder "C:\\irla_pdf\\ eme\\MPS_Pdfs_1 0_2011\\". this is fine, but the problem is in the below code

String newname=fname[i].substring(11,19)+".pdf";

Assume, inside your folder you have the file list like below

ABCDEF.txt
abc.txt
java.txt

for all these fname[i].substring(11,1 9) will fail.

From your code, you are trying to rename the file extension. Do like this to rename the extension.

String newname = fname[i].substring(0,fname[i].lastIndexOf(".")-1) + ".pdf";

Thanks,