Delete a line in the middle of a text file

Question

Hi, I want to delete a certain string line in the middle of a text file. How could I do this? Thanks.

Answer 1

Got it. But instead of overwriting with spaces I only need to write the letter "b":
try {
                                        RandomAccessFile acceso=new RandomAccessFile("F:/ArchivoContrase�as.txt","rw");
                                        String linea="";
                                        while ((linea = acceso.readLine()) != null) {
                                                  StringTokenizer patron=new StringTokenizer(linea," ;");
                                                  String s=patron.nextToken();
                                                  s=patron.nextToken();
                                                  if (elimina.equals(s)) {
                                                       System.out.println(acceso.getFilePointer());
                                                       acceso.seek(acceso.getFilePointer());
                                                       acceso.writeBytes("b");                         
                                   } catch (FileNotFoundException e) {
                                        e.printStackTrace();