equals template

@Override

public boolean equals(Object o) {

if (o == this) {

return true;

}

if (!this.getClass().isInstance(o)) {

return false;

}

final Beslag other = this.getClass().cast(o);

return new EqualsBuilder().append(artikelnr, other.artikelnr).append(prijs, other.prijs).isEquals();

}