ChangeFileContents Q

Question

Hi All - I can read and write to text files no problem but the issue of updating or inserting text into say the middle of a file is a little trickier. My java book doesn't have examples and I can't find any in past forum discussions. In the example below I want to insert 'peter' for 'paul'
text.txt
hello john
hello paul
hello michael
import java.io.*;
public class Hello {
     public static void main(String args []) throws IOException {
          File file = new File("C:\\text.txt");
          FileReader fileReader = new FileReader(file);
          FileWriter fileWriter = new FileWriter(file, true);
          BufferedReader br = new BufferedReader(fileReader);
          String s = null;
          String newline = "\r\n";
          while ((s = br.readLine()) != null)
               if(s.equals("hello paul"))
                    fileWriter.write(newline + s.replaceFirst("paul","peter"));
          fileReader.close();
          fileWriter.close();
}My program above gives me
hello john
hello paul
hello michael
hello peter
which is not what I want. Incidentally I didn't expect it to work! What I want is:-
hello john
hello peter
hello michael
Any suggestions would be great. I'II keep looking for a solution in the meantime.
Rgds, Robbie

Answer 1

I was hoping I wouldn't have to re-engineer things. What if I just wanted to change the last line. Would I still have to use a RandomAccessFile?