lingmaaki

NullPointerExceptions are exceptions that occur when you try to use a reference that points to no location in memory (null) as though it were referencing an object. Calling a method on a null reference or trying to access a field of a null reference will trigger a NullPointerException. For example, String s = null; int len = s.length(); // NullPointerException because s is null So you should check if the variable is null before calling any method on it, for example: int len; if (s == null) { len = 0; } else { len = s.length(); // safe, s is never null when you get here }

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