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How do I deal with NullPointerException?
NullPointerException is thrown when a reference variable is accessed (or de-referenced) and is not pointing to any object. This error can be resolved by using a try-catch block or an if-else condition to check if a reference variable is null before dereferencing it.
Is Nullpointer an unchecked exception?
Answer: The exception java. lang. NullPointerException is an unchecked exception and extends RuntimeException class. Hence there is no compulsion for the programmer to catch it.
How do I fix kotlin NullPointerException?
There are some best practices to avoid NullPointerException in Java that are mentioned some of them as below:
- String comparison with literals.
- Avoid returning null from your methods.
- Keep checking on arguments of methods.
- Use String.
- Using primitives data types as much as possible.
- Avoid chained method calls.
How do you throw exception Kotlin?
In Kotlin, there are only unchecked exceptions that are thrown during the runtime execution of the program. All exception classes descend from the class Throwable. Kotlin uses the throw keyword to throw an exception object.
Why do I get a null pointer exception?
Null Pointer Exception mostly occurs because of the null object or null reference. We have already seen the causes and ways to avoid NullPointerException. As far as possible, the programmer should try to avoid the occurrence of Null Pointer Exception in a program.
How to get rid of NullPointerException in Java?
Before every argument of the function we add @NonNull annotation. Also when we call this function, we put a try-catch block around the function call to catch NullPointerException. If any of the arguments given in the function turn out to be null, the function would throw a NullPointerException. This would then be caught by the try-catch block.
What to do if a string is null in Java?
But if the String variable that is an object is null, then comparing this null object to literals will throw NullPointerException. So the solution is to invoke the comparison method from the literal instead of the String object that can be null.
Is the NullPointerException a checked or Unchecked exception?
Answer: NullPointerException is not a checked exception. It is a descendant of RuntimeException and is unchecked. #3) How do I stop NullPointerException? Answer: Some of the best practices to avoid NullPointerException are: Use equals () and equalsIgnoreCase () method with String literal instead of using it on the unknown object that can be null.