Append a string to a file without overwritting.

Question

OK, let's do this as easy as can be...
I have a file "A.txt" and its contents is:
AAAAAAAAAAIf we retreive the File data, its length is 10.
Now, I have the next code:
import java.io.*;
public class MyClass {
    public static void writeToFile(File f, String writeThis, int where) throws IOException, FileNotFoundException {
        RandomAccessFile raf = new RandomAccessFile(f, "rw");
        raf.seek((long)where);
        raf.writeBytes(writeThis);
        raf.close();
    public static void main(String args[]){
        try {
            writeToFile(new File("A.txt"), "java", 3);
        } catch (Exception anyE) {}
}This is what I want:
File A.txt contents
AAAjavaAAAAAAA
   ^ Appended to the fileNow the file data length is 14, 10 A's + java (4)
This is what I get:
AAAjavaAAA
   ^ Overwrote the file contents.Now the file data length is still 10, Java overwrote 4 A's.
How can I append a string to a file at any desired position without overwriting nothing.
I've checked all java.io package and I found that only RandomAccessFile class allow me to have a file pointer in order to read from there.
It's important not to append data at the end of the file, I have some tokens there in my app.

Answer 1

Hi, i am trying to do the same thing. Can u use a randomaccessfile and seek to the pt where u want to insert. save that location. store the data from that pt to the end of the file in a string buffer. then append the string to be inserted at the position u had saved earlier. and then append the string buffer to it. think this should do it. i dont know if it works.
i had another problem .. i was looking to delete some portion from a file and maintain the continuity. for eg. i have file containing "aaaaajavaaaaaa" and i want to remove java .. from it resulting in "aaaaaaaaaa". is there a easier way to do it. let me know thanks