🚀 go-pugleaf

Hi Ahmad,

I think that there is no other solution than just to read the complete
file and then writing it again with all insertions at the correct place.

If you know all insertions beforehand, you can read the file up to
an insertion point, add the line(s) to be inserted and read again
until the next insertion point, etc.

Something like:

int linePointer = 0;
int insertionPointer = 0;
int[] insertionPoints = {20, 30, 40};
String[] insertionLines = {"line20", "line30", "line40"};
RandomAccessFile inFile = new RandomAccessFile("inFile.txt", "r");
ArrayList outFileArray = new ArrayList();
while ((String line = inFile.readLine()) != null) {
    if (linePointer == insertionPoint[insertionPointer]) {
        outFileArray.add(insertionLines[insertionPointer]);
        insertionPointer++;
    }
    outFileArray.add(line);
    linePointer++;
}

I have not tried to compile this yet so it might not work but this is the
idea.

Ronald.


Ahmad Noori wrote:

> Hello,
>
> I have a txt file that I want to write to it one line at a time.  I
> sometimes want to write in the middle of the file and sometimes at the
> beginning.  Using write(string, int, int), will replace the whole file,
> readline() reads one line at a time, does anyone knowof a  method that
> could write one line at a time.
>
> Thanks a lot
>
> Ahmad Noori
> SAIC