How to rename a file or folder.

Question

HI, I was thinking of some thing, but I need to know how to make java rename a file/folder like you do via dos.
Hope this is clear.
PS I had another post and I got the answer thanks for those who help, I lost the thing so couldn't reply(DUH').
So say I have "myfile.txt", and wanna rename to "yourfile.txt".
Just point my in the right direction if it's long.

Answer 1

import java.io.*;
public class Rename
     public static void main (String args [])
     { // main program
// File (or directory) with old name
file f1 = new File("newone.txt");
// File (or directory) with new name
File f2 = new File("newfile.txt");
// Rename file (or directory)
boolean success = f1.renameTo(f2);
if (!success)
// File was not successfully renamed
System.out.println("\nFile was renamed!\n\n");
This is what I have done, the import removed 3 of the 4 errors, but its still not working, this is the message.
C:\Documents and Settings\jonathan\Desktop\New Folder (2)\Rename.java:7: cannot resolve symbol
symbol: class file
location class rename
file f1 = new file("newone.txt")
^
1 error