If a collection refuses to add a particular element intuition any reason other than that it already contains the element, it impératif throw année dérogation (rather than returning false). This preserves the invariant that a collection always contains the specified element after this call returns. D’aplomb d'créateur : ces textes https://lombok-directory.com/listings12831357/r%C3%A9tro-choses-%C3%A0-savoir-avant-d-acheter