package myfile;
import java.io.*;
 
public class MyFile {
 
    public static void main(String[] args) {
     double []d={3,7,1,2.08,3.1,-9.1};
     write (d, "data.txt");
     read  (d, "data.txt");
      }
    static void read (double []d, String fname) {
      try(DataInputStream dos = 
                new DataInputStream(
                        new BufferedInputStream(
                                new FileInputStream(fname)))) {
                String s;      
                for (double di:d) {
                s = Double.toString(dos.readByte());
                      System.out.println(s);
                }
      }
       catch (IOException ex) {ex.printStackTrace();}                     
        
    }
    static void write (double []d, String fname) {
        try(DataOutputStream dos=
            new DataOutputStream(
                new BufferedOutputStream(
                    new FileOutputStream(fname)))) {
            for (double di:d)
                dos.writeBytes(Double.toString(di)+ " ");
        }
        catch (IOException ex) {ex.printStackTrace();}
    }
}