no compiling errors but it gives a weird error when i run it.

this is the error i get when i run it.

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0

at filecopier.main(filecopier.java:8)

Here is my code it's supposed to copt text from one file to another

import java.io.*;

class filecopier{

//this program copies text from one file to another

//the file names are read as command line arguments

publicstaticvoid main(String arg[]){

String f1n=arg[0];

String f2n=arg[1];

try{

DataInput f1 =new DataInputStream(new FileInputStream(f1n));

DataOutput f2 =new DataOutputStream(new

FileOutputStream(f2n));

String x =f1.readLine();

while (x!=null){

f2.writeBytes(x+"\r\n");

x=f1.readLine();

}//end while

}catch (Exception ex){String err=ex.toString() ;

System.out.println(err);}

}

}

what is wrong with it?

[1744 byte] By [dannyd73] at [2007-9-30 22:10:33]