package javaapplication41;







class Prostokat
{
    private int a;
    private int b;
    private int numer;

    private static int ile;

    Prostokat(int x, int y)
    {
        ile++;
        numer = ile;
        a=x;
        b=y;
    }

    int pole()
    {
        return a*b;
    }

    void opis()
    {
        System.out.println("Prosotkąt"+numer);
        System.out.println("a= "+a);
        System.out.println("b= "+b);
    }
    void wypiszPole()
    {
        System.out.println("Pole nr"+ numer+ " = "+this.pole());

    }
}

public class JavaApplication41 {
    public static void main(String[] args)
    {
        Prostokat p = new Prostokat(30, 20);
        Prostokat p1= new Prostokat(7, 12);
        p.opis();
        p1.opis();

        p1.wypiszPole();
        p.wypiszPole();
    }
}