@Override
    public boolean equals(Object o )
    {
        if(o == null)
            return false;
        if(!(o instanceof Kunde))
            return false;
        Kunde other = (Kunde)o;
        if (!other.getAddress().equals(this.getAddress()))
            return false;
        if(!other.getName().equals(this.getName()))
            return false;
        if(other.getNr()!= this.getNr())
            return false;
        return true;
    }