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What is a NullPointerException, and how do I fix it? What about on Android? On Android, tracking down the immediate cause of an NPE is a bit simpler The exception message will typically tell you the (compile time) type of the null reference you are using and the method you were attempting to call when the NPE was thrown This simplifies the process of pinpointing the immediate cause
Что такое Null Pointer Exception и как его исправить? Что из себя представляет исключение Null Pointer Exception (java lang NullPointerException) и почему оно может происходить? Какие методы и средства использовать, чтобы определить причину возникнов
Why toString() on an Object instance (which is null) is not throwing NPE? Just to be clear object toString() will guarantee an NPE if the object is null Try it out for yourself System out println() works on the object's reference to start with PrintWriter knows when a null reference is passed, so it will pass gracefully and print out null But if you try and call toString() from null it will surely throw NPE
When is it OK to catch NullPointerException? - Stack Overflow Usually there is no such reason Usually it's good either to check if variable is null or catch NPE and trow more appropriate reason For example if a method getCar() returned null you may catch NPE on trying to call some method of the car, or check if the car is null and throw RuntimeException (but only if the situation is really exceptionable)
Catching nullpointerexception in Java - Stack Overflow I tried using try-catch block to catch NullPointerException but still the following program is giving errors Am I doing something wrong or is there any other way to catch NullPointerException in
Is it okay to throw NullPointerException programmatically? In the case of a null argument IllegalArgumentException might be the more appropriate exception to throw NullPointerException is meant to indicate that an attempt was made to perform some operation on a null value If an NPE is what you are aiming for, then just forgo null checking in your method, and the NPE will be thrown by the JVM naturally