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QCM traiter le null en Java

leaSoloKwan
3,480 views
Est ce que le langage Java permet l'utilisation des pointeurs ?
Qu'est ce que le null en java ?
Quand est-ce que l'erreur NullPointerException apparait ?
Lesquelles de ces méthodes permettent d'éviter l'erreur NullPointerException en java ?
Quelle erreur produit ce code ? "Porte porte = null; porte.ouvrir();"
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