Does catch exception catch NullPointerException?
It is generally a bad practice to catch NullPointerException. Programmers typically catch NullPointerException under three circumstances: The program contains a null pointer dereference. Catching the resulting exception was easier than fixing the underlying problem.
Can you catch a 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.
How do I stop catching NullPointerException in Java?
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.
Is NullPointerException checked or unchecked?
Java NullPointerException (NPE) is an unchecked exception and extends RuntimeException . NullPointerException doesn’t force us to use a try-catch block to handle it.
When would you use an IllegalArgumentException?
2.1. When we read the Javadoc for IllegalArgumentException, it says it’s for use when an illegal or inappropriate value is passed to a method. We can consider a null object to be illegal or inappropriate if our method isn’t expecting it, and this would be an appropriate exception for us to throw.
What is IOException in Java?
IOException is the base class for exceptions thrown while accessing information using streams, files and directories. The Base Class Library includes the following types, each of which is a derived class of IOException : DirectoryNotFoundException. EndOfStreamException. FileNotFoundException.
Can we catch unchecked exception?
Yes, you can throw unchecked exceptions with throw . And yes, you can catch unchecked exceptions in a catch block. You can also propagate them with throws explicitly, which is optional, but can make things clearer in the method signature.
Is IllegalArgumentException a checked exception?
IllegalArgumentException (along with some others, for example NullPointerException ) are examples of a RuntimeException . This type of exception is not what’s known as a checked exception.