Java - reading text file to an array

[bassman]

Aloha!

I can't find an example on how to read a text (sequential) file to an array. Anybody knows how to? By the wqay, if you can tell me how to do the reverse, it would be nice also

[qball]

well, if you can do one way, you can basically just reverse and do backwards, though you will need write file privileges to write file, whereas just read privileges to read file.

to read a file line by line:

String line= "";
BufferedReader textIn = new BufferedReader(new FileReader(new File("filename.ext")));
line = textIn.readLine();
while (line != null){
	do something, like add array element
	}

which leads to a ? what type of array? Does it have to be array?

And better yet of what size, as you will need to declare this size. Something like a Vector may be more useful.

Anyway to write to a file is just as easy.

[code]
fo = new FileOutputStream (filename.ext, true );
fo.write( "string");
fo.write( "string");
fo.write( 1234);
fo.close();
[\code]

edit
my bad, using my own java, lol, try:

			java.io.FileOutputStream fo;
			fo = new FileOutputStream ("filename.ext", true );
			fo.write( "output\n".getBytes());
			fo.write( "output\n".getBytes());
			fo.write( "1234\n".getBytes());
			fo.close();

edit

[bassman]

Hum...I think I'm getting somewhere here. It's an entrance control application and it has to be done with an array of type StudentCard. Each student card contains several atributes: I'm attaching the text file with this post. Mainly, I'll have to load everything from the file to the array, work on it and resend it to the file. Each position of the array will have one student card.

[qball]

aloha is hawaii (an)?

hola, is spanish.

what's a:

"StudentCard"

do your own homework.

what's a:

"entrance control application"

?

"'ll have to load everything from the file to the array, work on it and resend it to the file"

Then, you'll need to read in the file, put into an array, work on it, and then, resend back to original file, where you got it from?

or something like that?