gistfile1.java

public class Punkt {

    protected int x;
    protected int y;

    public Punkt(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public void addPunkt(Punkt p) {
        this.x += p.x;
        this.y += p.y;
    }

    public String toString() {
        return "X: " + this.x + ", Y: " + this.y;
    }

}




public class PunktZ extends Punkt {

    protected int z;

    public PunktZ(int x, int y, int z) {
        super(x, y);
        this.z = z;
    }

    public void addPunkt(PunktZ p) {
        super.addPunkt(p);
        this.z += p.z;
    }

    public String toString() {
        return super.toString() + ", Z: " + this.z;
    }

}





public class Main {

    public static void main(String[] args) {
        Punkt p1 = new Punkt(5, 10);
        Punkt p2 = new Punkt(3, 8);
        p1.addPunkt(p2);

        System.out.println(p1.toString());

        PunktZ pz1 = new PunktZ(5, 10, 3);
        PunktZ pz2 = new PunktZ(3, 8, 1);
        pz1.addPunkt(pz2);

        System.out.println(pz1.toString());
    }
}