How to append information to an existing file 1

[RookThis]

How do you go about appending information to an existing file using Java? It's a bit confusing and I need some guidance in understanding the process.

Thank you in advance for the assistance!

 

[Batlin]

The second argument to the FileOutputStream constructor, which I assume you're using, is a flag specifying whether to append to the file.
(see

http://java.sun.com/j2se/1.5.0/docs/api/java/io/FileOutputStream.html)

So in your case, you might have:
FileOutputStream out = new FileOutputStream(new File("log.txt"), true);

And then use something like DataOutputStream to output.
DataOutputStream dataOut = new DataOutputStream(out);
dataOut.writeInt(123);

Or maybe PrintWriter et al would suit, if you're writing text.

Check out

http://www.cs.usfca.edu/~parrt/course/601/lectures/io.html

for some better examples!

 

[RookThis]

Thanks for the site information. It helped to get what I need. One question I still have. If I have a text file and say numbers and I want to delete an entry and update the file, is there a procedure for that in Java? I found some information about a seek parameter. Any suggestions?

Thanks

 

[obadare]

Options:
1. RandomAccessFile
2. java.sql - usinf text driver
3. java.util.regex

 

[Canelas]

what's the structure of the text file?