Read and edit text file

[VinTiger]

I'm trying to make a program that not only reads a text file into an array, but i also need to add the ability to edit the text file, as well as navigate back and forth through the entire file. I'm more than a little bit stuck so any help is greately appreciated.

Thanks

[Supamagier]

First read the entire file (if it's not too big, that is) using

BufferedReader file = new BufferedReader(new FileReader(FILE));
file.readLine();
file.close();

Put every line in a slot of an array.
Edit the things you want to edit
When done, write everything to a completely new file

BufferedWriter file = new BufferedWriter(new FileWriter(FILE));
file.write(String);
file.flush();
file.close();

Something like that ;)

Of course, this is just one of the many possibilities.

~Matt

[Singing Boyo]

I believe BufferedReader waits until there is another line to read, so unless you do some checking, it will freeze. Another way to read the file is to use

Scanner scan = new Scanner(FILE);
ArrayList<String> lines = new ArrayList<String>();
while(scan.hasNext()){
     lines.add(scan.readline())
}
//and closing the scanner and conversion of the ArrayList to an array

As for writing the file, I can't help you there, srry.

Hope this helps,
Singing Boyo

[Supamagier]

Good point, forgot about that ;)

String line;
while ((line = file.readLine()) != null)
    // Put 'line' in array

That should fix it ;)

[VinTiger]

thanks guys, I'll try this:)

[Singing Boyo]

still won't work... cant call file.readLine() if there is no line to be read :D

Use a Scanner :p