Not able to rename the existing file

Question

Hi All,
I have a java file Test.java in which i am doing the following stuffs.
1) I am creating a new file
2) Entering contents in the existing file
3) Renaming the existing file--When i am doing this i am not getting any error but the existing file is not renamed
The contents of the file Test.java*************************
package com.fidelity.ereview.utils;
import java.io.*;
public class Testing {
     public static void main(String[] args) throws IOException {
          File f = new File("D:/TCS/myfile1.txt");
          f.createNewFile();
          System.out.println("new file " + f + " is created");
          FileOutputStream fileobj = new FileOutputStream(f);
          DataOutputStream writeInsideFileObj = new DataOutputStream(fileobj);
          writeInsideFileObj.writeBytes("sunita");
          writeInsideFileObj.writeBytes(",");
          writeInsideFileObj.writeBytes("choudhury");
          File f2 = new File("D:/TCS/myfile2.csv");
          f.renameTo(f2); **// renames the file HERE The file is not renamed**
Kindly anybody help me....

Answer 1

import java.io.*;
public class Testing {
public static void main(String[] args) throws IOException {
//File f = new File("D:/TCS/myfile1.txt");
File f = new File("D:/TCS/myfile2.csv");//above replaced by
f.createNewFile();
System.out.println("new file " + f + " is created");
FileOutputStream fileobj = new FileOutputStream(f);
DataOutputStream writeInsideFileObj = new DataOutputStream(fileobj);
writeInsideFileObj.writeBytes("sunita");
writeInsideFileObj.writeBytes(",");
writeInsideFileObj.writeBytes("choudhury");
writeInsideFileObj.close();//I added
fileobj.close();//I added
//File f2 = new File("D:/TCS/myfile2.csv");
//f.renameTo(f2); **// renames the file HERE The file is not renamed**
}Why create a file add data to the file and then rename to change the file type?
You can add data to any file type with java.