Controlling position in file

Question

Hello
When reading from file I use an InputStreamReader wrapped in a BufferedReader. The BufferedReader provides me with the 'mark(int)' method and 'reset()' method for controlling the position. It appears slightly cumbersome. Im used with 'rewind()' to place pointer at start, and backspace() for previouse line, but maybe the mark(int) method is the only way to control this in Java?
Also, what integer do you use as parameter for mark(). I did not quite understand the API for this.
Regards
JT

Answer 1

As I allways try to post some sample:
You should have a file named Some.txt on your root(/) directory or in your c:\ with three lines of text.
package example;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
* @author leonardo     09/11/2004
* @version 1.0
public class FileIO {
    private RandomAccessFile raf;
    public static void main(String[] args) {
        File file = new File( "/c:/Some.txt" );
        try {
            FileIO fileIO = new FileIO( file);
            System.out.println(fileIO.readLine());
            System.out.println(fileIO.readLine());
            fileIO.reset();
            System.out.println(fileIO.readLine());
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
     * Create a file IO class.
     * @throws FileNotFoundException
     *           when the file does not exists.
    public FileIO(File file ) throws FileNotFoundException {
        this.raf = new RandomAccessFile(file, "rw" );
     * Reads one line of the file.
     * @return The line readden.
     * @throws IOException When there is an IO error.
    public String readLine() throws IOException {
       return raf.readLine();
     * Set the file pointers to the start of the file.
     * @throws IOException
    public void reset() throws IOException {
        raf.getChannel().position(0);
}