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Script to rename all *.txt extensions successive numbers

I have a directory of over 700,000 text files. I need to run them through another program, however in order for that program to work each text file must have numerical extension in the format .00x where x is any number. What that program does is it takes info in each of the text files and dumps it into a spreadsheet. What I need to do is figure out how to rename all of the *.txt extensions in the directory so that each file has a different number, and what number they have is not important.

For example

A.txt
B.txt
C.txt

would become

a.001
b.002
c.003

Any Ideas?

sudhakar_koundinya

File dir =new File("c:/");

File files[]=dir.listFiles();

for(int i=0;i<files.length;i++)
{
if(files[i].toString().endsWith(".txt"))
{
files[i].renameTo(new File(files[i].toString().substring(0,files[i].toString().length()-4));
}
}

sudhakar_koundinya

File dir =new File("c:/");

File files[]=dir.listFiles();
int k=0;
for(int i=0;i<files.length;i++) {
if(files[i].toString().endsWith(".txt")) {
String str=files[i].toString();
int n=str.indexOf(".txt");
if(n!=-1)
{
str=str.substring(0,n);
files[i].renameTo(new File(str+"."+(k++)));
}

}
}

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sudhakar_koundinya

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sudhakar_koundinya

thanks mate :)