Java. How to append text to top of file.txt -

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• writing in beginning of text file java 5 answers

i need add text beggining of text file via java.

for example have test.txt file data:

peter john alice 

i need add(to top of file):

jennifer  

it should be:

jennifer peter john alice 

i have part of code, append data end of file, need make added text top of file:

    public static void irasymas(string irasymai){         try {          file file = new file("src/lt/test.txt");                  if (!file.exists()) {                 file.createnewfile();             }              filewriter fw = new filewriter(file.getabsolutefile(), true);             bufferedwriter bw = new bufferedwriter(fw);             bw.write(irasymai+ "\r\n");             bw.close(); }         catch (ioexception e) {         e.printstacktrace();                         }     } 

i have tried this, deletes data file , not insert text:

public static void main(string[] args) throws ioexception {         bufferedreader reader = null;         bufferedwriter writer = null;         arraylist list = new arraylist();          try {             reader = new bufferedreader(new filereader("src/lt/test.txt"));             string tmp;             while ((tmp = reader.readline()) != null)                 list.add(tmp);             outil.closereader(reader);              list.add(0, "start text");             list.add("end text");              writer = new bufferedwriter(new filewriter("src/lt/test.txt"));             (int = 0; < list.size(); i++)                 writer.write(list.get(i) + "\r\n");         } catch (exception e) {             e.printstacktrace();         } {             outil.closereader(reader);             outil.closewriter(writer);         }     } 

thank help.

you can use randomaccessfile , seek cursor 0th position using seek(long position) method, before starting write.

as explained in this thread

randomaccessfile f = new randomaccessfile(new file("yourfile.txt"), "rw"); f.seek(0); // beginning f.write("jennifer".getbytes()); f.close(); 

edit: pointed out below many comments, solution overwrites file content beginning. replace content, file may have deleted , re-written.