Re: Writing Binaries to and Reading Binaries from Disk

From:
Knute Johnson <nospam@rabbitbrush.frazmtn.com>
Newsgroups:
comp.lang.java.programmer
Date:
Sat, 26 Sep 2009 12:45:11 -0700
Message-ID:
<4abe6f47$0$31032$b9f67a60@news.newsdemon.com>
KevinSimonson wrote:

I'm planning on writing a program that stores a lot of binary informa-
tion, and I'd like to be able to write it to disk when I'm done with
it, so that later I can read it in from disk again. How do you do
that in Java, write binary <short>s to disk and then later read in
those <short>s from disk again?

Kevin Simonson

"You'll never get to heaven, or even to LA,
if you don't believe there's a way."
from _Why Not_


I'm not sure what a binary <short> is but to write a Java short to a
stream you can use the DataOutputStream class. Also you can convert it
to bytes and use a regular OutputStream. Also see BufferedOutputStream.

import java.io.*;

public class test4 {
     public static void main(String[] args) throws IOException {
         FileOutputStream fos = new FileOutputStream("data.dat");
         DataOutputStream dos = new DataOutputStream(fos);
         short s1 = -32768;
         dos.writeShort(s1);
         dos.close();

         FileInputStream fis = new FileInputStream("data.dat");
         DataInputStream dis = new DataInputStream(fis);
         short s2 = dis.readShort();
         dis.close();

         System.out.print(s2);
     }
}

--

Knute Johnson
email s/nospam/knute2009/

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