Should you attempted to debug the challenge and however haven't got an answer, you can submit a matter for more help, but Ensure that you contain what you've experimented with up to now.
Thrown when an application attempts to work with null in a very scenario where by an item is needed. These include things like:
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But about the flipside, Android has some common platform-specific brings about for NPEs. A very common is when getViewById unexpectedly returns a null. My assistance could be to look for Q&As about the cause of the unforeseen null return price.
Note that in a far more intricate instance, there'll be numerous traces while in the NPE stack trace. However, you can be sure that the 2nd line (the primary "at" line) will tell you wherever the NPE was thrown1.
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object can not be null. The benefit of validating this is always that 1) you could return your own personal clearer error messages and a pair of) for the rest of the strategy you know that Unless of course obj is reassigned, It's not at all null and may be dereferenced securely.
The capacitance of the parallel-plate capacitor, consequences of dielectric inside of a capacitor Inna Shpiro
After that, I consider to treat the reference as if it details to an object by calling a method on it. This ends in a NullPointerException simply because there is not any code to execute in The placement the reference is pointing.