Can we handle NullPointerException in Java?
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Can we handle NullPointerException in Java?
In Java, the java. lang. 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.
Why is NullPointerException unchecked?
A NullPointerException (usually) occurs because there is some bug in your code. If you expect a NullPointerException to be thrown, the correct solution is to fix the bug rather than to handle the exception.
How do you handle a NullPointerException in a list in Java?
Effective Java NullPointerException Handling
- Check Each Object For Null Before Using.
- Check Method Arguments for Null.
- Consider Primitives Rather than Objects.
- Carefully Consider Chained Method Calls.
- Make NullPointerExceptions More Informative.
Is FileNotFoundException checked or unchecked?
FileNotFoundException is a checked exception in Java. Anytime, we want to read a file from the filesystem, Java forces us to handle an error situation where the file may not be present in the place.
How do I capture a NullPointerException?
To avoid the NullPointerException, we must ensure that all the objects are initialized properly, before you use them. When we declare a reference variable, we must verify that object is not null, before we request a method or a field from the objects.
What happens if exceptions are not handled?
if you don’t handle exceptions When an exception occurred, if you don’t handle it, the program terminates abruptly and the code past the line that caused the exception will not get executed.
Why do we need to handle exceptions in Java?
Java exception handling is important because it helps maintain the normal, desired flow of the program even when unexpected events occur. If Java exceptions are not handled, programs may crash or requests may fail. There can be many causes for a sudden crash of the system, such as incorrect or unexpected data input.