package zad1;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Locale;

public class Main
{
    public static void main (String [] args)throws IOException
    {
        Macbin ob = new Macbin (5,7);
        ob.wypelnij();
        ob.zapisz();
        ob.czytaj();
    }
}



package zad1;

import java.util.Random;
import java.io.*;

public class Macbin
{
private int lw;
private int lk;
private double tablica [][];
    public Macbin (int n, int m)
    {
    this.lw=n;
    this.lk=m;
    this.tablica=new double [lw][lk];
    }

public void wypelnij ()
{
    Random losowe = new Random ();
    for (int i=0;i<lw;i++)
    {
        for (int j=0;j<lk;j++)
        {

            tablica[i][j]=(losowe.nextDouble()*10);
        }
    }
    System.out.println("binarna:");
    for (int i=0;i<lw;i++)
    {
        for (int j=0;j<lk;j++)
        {
            System.out.printf("%.2f",tablica[i][j]);
            System.out.print(" ");
        }
        System.out.println();
    }
}
public void zapisz () throws FileNotFoundException
{
    try
    {
    File plik = new File("dane.dat");
    DataOutputStream zapis = new DataOutputStream(new FileOutputStream(plik));
    for (int i=0;i<lw;i++)
        {
            for (int j=0;j<lk;j++)
            {
            zapis.writeDouble(tablica[i][j]);
            }
        }
    zapis.close();
    }
    catch(IOException e)
    {
        System.out.println("blad");
    }
}
public void czytaj ()throws IOException
{
    DataInputStream odczyt = new DataInputStream(new FileInputStream("dane.dat"));
    double [][] tabb = new double[lw][lk];
    try
    {
        for (int i=0;i<lw;i++)
        {
            for (int j=0;j<lk;j++)
            {
                tabb [i][j]=odczyt.readDouble();
            }
        }
    }
    catch (FileNotFoundException e)
    {
        System.out.println("nie znaleziono pliku");
    }
    System.out.println("binarna odczytana z pliku:");
    for (int i=0;i<lw;i++)
    {
        for (int j=0;j<lk;j++)
        {
            System.out.printf("%.2f",tabb[i][j]);
            System.out.print(" ");
        }
        System.out.println();
}
}
}