Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

How do I create, read and write binary records to a file?

Posted on 2006-11-01
6
Medium Priority
?
184 Views
Last Modified: 2010-03-31
Hello,
This question is kinda basic, but it is something I cannot find any reference to do. I want to be able to create a record of a fixed size. Two Long integers stored in a record / class of some sort. Then I need to be able to write this data record by record to a binary file. I also need to know how to read this binary data back out of the file.

Please provide code examples.

Worth 500 points.

Rick
0
Comment
Question by:richardsimnett
6 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 17849462
0
 
LVL 24

Assisted Solution

by:sciuriware
sciuriware earned 800 total points
ID: 17849465
Use RandomAccessFile:

  RandomAccessFile f = new RandomAccessFile(new File("myfile"), "rw");
  long[] k = new long[2];

  k[0] = f.readLong();
  k[1] = f.readLong();
 
;JOOP!
0
 
LVL 24

Expert Comment

by:sciuriware
ID: 17849482
To write the same 'k' after 1200 bytes:

    f.seek(1200L);
    f.writeLong(k[0]);
    f.writeLong(k[1]);

;JOOP!
0
Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

 
LVL 92

Accepted Solution

by:
objects earned 1200 total points
ID: 17853072
agree with sciuriware, you'll find a good intro/example of using RAF here:

http://java.sun.com/developer/TechTips/2000/tt0509.html
0
 

Author Comment

by:richardsimnett
ID: 17881432
Thanks!

0
 
LVL 24

Expert Comment

by:sciuriware
ID: 17881469
:)
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Java had always been an easily readable and understandable language.  Some relatively recent changes in the language seem to be changing this pretty fast, and anyone that had not seen any Java code for the last 5 years will possibly have issues unde…
In this post we will learn different types of Android Layout and some basics of an Android App.
Video by: Michael
Viewers learn about how to reduce the potential repetitiveness of coding in main by developing methods to perform specific tasks for their program. Additionally, objects are introduced for the purpose of learning how to call methods in Java. Define …
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
Suggested Courses

877 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question