////Figury\\\\\

package javaapplication2;

public abstract class Figury {

    protected double a;
    protected String typ;
    protected double obwod, pole;


    public Figury(String typ)
     {
        this.typ=typ;

     }

    abstract String KlasaFigury();
    abstract double Obwod();
    abstract double Pole();
    abstract void Wyswietl();
}

////Okrag\\\\


package javaapplication2;

public class Okrag extends Figury{

    private double r;

    public Okrag(String typ, double r)throws NiepoprawneDane
       {
        super(typ);
        if(r<=0)
               throw new NiepoprawneDane();
        else
        this.r=r;

       }


    String KlasaFigury() {
        return typ;
    }


    public double Obwod() {
        obwod = 6.28*r;
        return obwod;

    }


    public double Pole() {
        pole = r*r*3.14;
        return pole;

    }

    void Wyswietl() {
        System.out.print("Figura: " +KlasaFigury() + "\n");
        System.out.print("Pole: " +Pole() + "\n");
        System.out.print("Obwod: " + Obwod() + "\n");

    }

}

////Trojkat\\\\

package javaapplication2;


public class Trojkat extends Figury{

    private double b, c;

    public Trojkat(String typ, double a, double b, double c)throws NiepoprawneDane
       {
            super(typ);
        if(a<=0 || b<=0 || c<=0 || a+b<c || b+c<a || a+c<b)
               throw new NiepoprawneDane();
        else
        this.a=a;
        this.b=b;
        this.c=c;
       }


    String KlasaFigury() {
        return typ;
    }


    public double Obwod() {
        obwod = a+b+c;
        return obwod;

    }


    public double Pole() {
        pole = 0.5*(a+b+c);
        return pole;

    }

    void Wyswietl() {

        System.out.print("Figura: " +KlasaFigury() + "\n");
        System.out.print("Pole: " +Pole() + "\n");
        System.out.print("Obwod: " + Obwod() + "\n");
    }


}

////Prostokat\\\\\

package javaapplication2;


public class Prostokat extends Figury {

    private double b;

    public Prostokat(String typ, double a, double b)throws NiepoprawneDane
    {
       super(typ);
        if(a<=0 || b<=0)
               throw new NiepoprawneDane();
        else
        this.a=a;
        this.b=b;

    }

    String KlasaFigury() {
        return typ;
    }


    public double Obwod() {
        obwod = 2*a+2*b;
        return obwod;

    }


    public double Pole() {
        pole = a*b;
        return pole;

    }

    void Wyswietl() {
        System.out.print("Figura: " +KlasaFigury() + "\n");
        System.out.print("Pole: " +Pole() + "\n");
        System.out.print("Obwod: " + Obwod() + "\n");

    }


}


/////Grupa\\\\\

package javaapplication2;

public class Grupa{

    private String[] Tab;
    private int n;

    public Grupa(int n)
    {
        this.n=n;
    }


    String KlasaFigury() {
        throw new UnsupportedOperationException("Not supported yet.");
    }


    double Obwod() {
        throw new UnsupportedOperationException("Not supported yet.");
    }


    double Pole() {
        throw new UnsupportedOperationException("Not supported yet.");
    }


    void Wyswietl() {
        throw new UnsupportedOperationException("Not supported yet.");
    }

}


////NiepoprawneDane\\\\\


package javaapplication2;

public class NiepoprawneDane extends Exception {


}