java - Strange symbols when using byte-based FileOutputStream, char-based FileWriter is OK -

task :

write java application creates file on local file system contains 10000 randomly generated integer values between 0 , 100000. try first using byte-based stream , instead using char-based stream. compare file sizes created 2 different approaches.

i made byte-based stream. after run program, in fileoutput weird symbols. doing wrong ?

import java.io.file; import java.io.fileoutputstream; import java.io.ioexception; import java.util.random;  public class bytebased {      public static void main(string[] args) throws ioexception {      file outfile = new file( "fileoutput.txt" );     fileoutputstream fos = new fileoutputstream(outfile);      random rand = new random();     int x;      for(int i=1;i<=10001;i++){          x = rand.nextint(10001);         fos.write(x);     }     fos.close();     } } 

when i'm using char-based stream works:

import java.io.file; import java.io.filewriter; import java.io.ioexception; import java.util.random;  public class charbased {      public static void main(string[] args) throws ioexception {      file outfile = new file( "fileoutput2.txt" );     filewriter fw = new filewriter(outfile);      random rand = new random();     int x;     string y;     for(int i=1;i<=10001;i++){          x = rand.nextint(10001);          y=x + " ";          fw.write(y);     }      fw.close();      } } 

writing regular output file directly fileoutputsream that, need convert output bytes first. :

public static void main(string[] args) throws ioexception {      file outfile = new file( "fileoutput.txt" );     fileoutputstream fos = new fileoutputstream(outfile);      string numbers = "";      random rand = new random();      for(int i=1;i<=10001;i++){         numbers += rand.nextint(10001);     }      byte[] bytesarray = numbers.getbytes();     fos.write(bytesarray);     fos.flush();     fos.close(); }