أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
When you see "NullPointException", it means that you are using a variable that is not instantiated.
Any Java variable you declare, then instantiate by the 'new' keyword, will "point" to a location in memory. It is a reference to this location. NullPointerException is just a name, it could be anything. When you try to use a variable which is NOT YET instantiated, it points nowhere and can do noting. hence the exception.
هل تحتاج لمساعدة في كتابة سيرة ذاتية تحتوي على الكلمات الدلالية التي يبحث عنها أصحاب العمل؟