import java.io.*;
import java.util.Scanner;

class Lab6{
    int w,k;
    double [][]tab;

    public Lab6(int w , int k)
    {
       this.k=k;
       this.w=w;
       tab = new double [w][k];
    }

    public void wypelnij(double zakres)
    {
        double pom=0;
        for (int i=0; i<w; i++)
            for (int j=0; j<k; j++)

                tab[i][j]=(Math.random()*zakres);

    }

    public void wyswietl()
    {
        for (int i=0; i<w; i++)
        {
            for (int j=0; j<k; j++)
                System.out.printf("%8.2f ",tab[i][j] );
                System.out.println();
        }
    }

    public void przekaz() throws FileNotFoundException
    {
        PrintWriter out= new PrintWriter("lab6.txt");

        out.println("Macierz ");
        out.println(w);
        out.println(k);

        for (int i=0; i<w; i++)
        {
            for (int j=0; j<k; j++)
                out.printf("%8.2f ",tab[i][j]);
                out.println();
        }
        out.close();
    }

    public void odczytaj() throws FileNotFoundException
    {
        File plik = new File("lab6.txt");
        Scanner in = new Scanner(plik);
        String [][]tab1 = new String [w][k];

        in.next();
        in.next();
        in.next();

        for (int i=0; i<w; i++)
        {
            for (int j=0; j<k; j++)
                tab1[i][j]=in.next();

        }
        in.close();


        for (int i=0; i<w; i++)
        {
            for (int j=0; j<k; j++)
                System.out.print(tab1[i][j] + "\t");
                System.out.println();
        }
    }

    public static void main (String []args) throws FileNotFoundException
    {
        Lab6 l = new Lab6(5,5);
        l.wypelnij(20);
        l.wyswietl();
        l.przekaz();
        l.odczytaj();

    }
}