java - How to sequentially numbering files rather than overwriting them when moving -

i writing code move file 1 directory another, have issue having file have same name, decided number them don't want overwrite them.

assume have file a.txt, succeed move move file same name call a_1.txt, wondering can if have again a.txt?

moreover, feel code not efficient , appreciated if me enhance it.

my code is:

/*  * method move specific file directory  */ public static void movefile(string source, string destination) {      file file = new file(source);      string newfilepath = destination + "\\" + file.getname();     file newfile = new file(newfilepath);      if (!newfile.exists()) {         file.renameto(new file(newfilepath));     } else {         string filename = filenameutils.removeextension(file.getname());         string extention = filenameutils.getextension(file.getpath());         system.out.println(filename);         if (isnumeric(filename.substring(filename.length() - 1))) {             int filenum = integer.parseint(filename.substring(filename.length() - 1));             file.renameto(new file(destination + "\\" + filename + ++filenum + "." + extention));         } else {             file.renameto(new file(destination + "\\" + filename + "_1." + extention));         }     }//end else } 

from main, called following (note managefiles class name method exist in):

    string source = "l:\\test1\\graduate.jpg";     string destination = "l:\\test2";     managefiles.movefile(source, destination); 

you can use logic:

if file exists in destination, add "(1)" file name (before extension). ask me: if there's file "(1)"? use (2). if there's 1 (2) too, use (3), , on.

you can use loop acomplish this:

/*  * method move specific file directory  */ public static void movefile(string source, string destination) {     file file = new file(source);     string newfilepath = destination + "\\" + file.getname();     file newfile = new file(newfilepath);     string filename;     string extention;      int filenum;     int cont;     if (!newfile.exists()) {         file.renameto(new file(newfilepath));     } else {         cont = 1;         while(newfile.exists()) {             filename = filenameutils.removeextension(file.getname());             extention = filenameutils.getextension(file.getpath());             system.out.println(filename);             newfile = new file(destination + "\\" + filename + "(" + cont++ + ")" + extention);         }         newfile.createnewfile();     }//end else }