import java.io.*;

public class nevekExample {

    public static void main(String[] args) {
        try {

            RandomAccessFile fileBeKi = new RandomAccessFile("nevek.txt", "rw");


            while (fileBeKi.getFilePointer() < fileBeKi.length()) {
                String sor=fileBeKi.readLine();
                System.out.println(sor);

            }
            System.out.println(fileBeKi.length());
            fileBeKi.seek(fileBeKi.length());
            fileBeKi.writeBytes("Karolina\n");

            fileBeKi.seek(0);
            for (String sor=fileBeKi.readLine(); sor != null; sor=fileBeKi.readLine())
              System.out.println(sor);



            fileBeKi.close();
        /*} catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }*/
    } catch (IOException e){System.err.println("Hiba a fileművelet közben: " + e);}

    }
}