java - Rename a known file using a list of string from a .txt file -

i'm trying write code lets me rename specific file (with known name , directory) using txt file has inside list of names. specificly, want rename episode using txt file has names of episodes in season.

this code wrote: main class:

import java.io.ioexception;   public class main {      public static void main(string[ ] args) throws ioexception {             string file_name = "c:/users/home/desktop/friends season 2 titles.txt";             try {                 readfile file = new readfile (file_name);                 string[] arrlines = file.openfile();                 int i;                 /*for ( i=0; < arrlines.length; i++ ) { // perhaps i'll use loop later on...                 system.out.println( arrlines ) ;                 }                 */                 renamefile newfile = new renamefile ();                 string file2_name = "c:/users/home/desktop/friends_s02e01_720p_bluray_sujaidr.mkv";                 newfile.renamesinglefile(arrlines[0], file2_name);             }             catch (ioexception e) {                 system.out.println(e.getmessage());              }     } } 

readfile class:

    import java.io.ioexception; import java.io.filereader; import java.io.bufferedreader;  public class readfile {     private string path;     public readfile(string filepath){         path = filepath;     }     int readlines() throws ioexception {         filereader file_to_read = new filereader(path);         bufferedreader bf = new bufferedreader(file_to_read);          @suppresswarnings("unused")         string aline;         int numoflines = 0;          while ((aline = bf.readline()) != null){             numoflines++;         }         bf.close();         return numoflines;      }     public string[] openfile() throws ioexception {           filereader fr = new filereader(path);         bufferedreader textreader = new bufferedreader(fr);          int numberoflines = readlines();         string[] textdata = new string[numberoflines];         (int i=0; < numberoflines; i++) {         textdata = textreader.readline();         }         textreader.close( );         return textdata;     }  } 

renamefile class:

import java.io.file; public class renamefile {     public void renamesinglefile(string file1_path, string file2_path){         file oldname = new file (file1_path);         file newname = new file (file2_path);          if(oldname.renameto(newname)) {              system.out.println("the file has been renamed to: " +newname);           } else {              system.out.println("the file not renamed.");           }     }    } 

for reason, when run program message in console: "the file not renamed.", means there's wrong renamesinglefile method (or parameters file1_path , file2_path of method).

i don't know wrong piece of code...

in renamesinglefile method should put file2_name (the title renamed) first parameter, , include directory path , file type when naming:

newfile.renamesinglefile(file2_name, "c:/users/home/desktop/" + arrlines[0] + ".mkv")