How to Rename File or Directory in Java

import java.io.*;

public class RenameFileDirectory{

public static void main(String[] args) throws IOException{
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Please enter the file or directory name to be Renamed : ");

String old_name = in.readLine();
File oldfile = new File(old_name);


if(!oldfile.exists())
{

System.out.println("File or directory does not exist.");

System.exit(0);

}

System.out.print("Please enter the new file or directory name : ");

String new_name = in.readLine();

File newfile = new File(new_name);

System.out.println("Old File or directory name : "+ oldfile);
System.out.println("New File or directory name : "+ newfile);
boolean Rename = oldfile.renameTo(newfile);


if(!Rename)
{

System.out.println("File or directory does not rename successfully.");

System.exit(0);

}

else {

System.out.println("File or directory rename is successfully.");

}

}

}