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Thread: Writing Integers to .txt File; Returning Random Characters Instead of Integers

  1. #1
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    Default Writing Integers to .txt File; Returning Random Characters Instead of Integers

    Hi everybody,

    This project is a bit beyond the scope of my class right now, but it's relevant to what we are working on and I was interested so I figured I'd give it a shot. I'm trying to generate 100 random numbers and write them to a .txt file (to be used in another project I've written). Here is my code:

    import java.io.*;
    import java.util.Random;
     
    public class intToFile_main {
     
    	/**
    	 * @param args
    	 */
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
     
    		generateFile("C:\\CSEclipseWorkspace\\intToFile\\numbers.txt");
    	}
     
    private static void generateFile(String fileName) {
     
    	try{
     
    		FileOutputStream fos = new FileOutputStream(fileName);
    		DataOutputStream dos = new DataOutputStream(fos);
     
    		Random generator = new Random();
     
    		for (int i = 0; i <= 99; i++) {
    			int num = generator.nextInt(99) + 1; //generate a random number
    			dos.writeInt(num); //write the number to the file
    		}
     
    		dos.close();
     
    		}
     
    		catch (IOException e)
    		{
    			e.printStackTrace();
    		} 
     
    	}
    }

    As far as I can tell, it's working, except that rather than displaying numbers, the document reads something like this (it's different every time because of the random number generator):

    ? > 8 0 S ( " _ Y 9 ( P R P ( @ W % W ? ? ; = C - K > S O 2 a \ L O U " X a
    Y $ ( + \ [ 7 # ? & # W c a X ; @ / 5 V / b I : V b G O $ Z 6 2 9 S -
    Does anyone have any idea as to what's going on and how I can fix it? Thanks very much!


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: Writing Integers to .txt File; Returning Random Characters Instead of Integers

    Do you want to write out the string representation of the characters, or the actual bit values of the integer? What you have right now is writing out the actual bit values (which result in a file which looks like garbledy goop).

    Try creating a PrintWriter object instead of a DataOutputStream to your file and you can write out the string representation of the integers/other numbers.

  3. The Following User Says Thank You to helloworld922 For This Useful Post:

    verbicidalmaniac (March 8th, 2011)

  4. #3
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    Default Re: Writing Integers to .txt File; Returning Random Characters Instead of Integers

    It worked! Thank you so much!!!

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