Does catching exception 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. The program explicitly throws a NullPointerException to signal an error condition.
Why does NullPointerException occur?
What Causes NullPointerException. The NullPointerException occurs due to a situation in application code where an uninitialized object is attempted to be accessed or modified. Essentially, this means the object reference does not point anywhere and has a null value.
How do I ignore the 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.
- Use valueOf() instead of toString() ; and both return the same result.
- Use Java annotation @NotNull and @Nullable.
What is @nullable Java?
The @Nullable annotation helps you detect: Method calls that can return null. Variables (fields, local variables, and parameters), that can be null.
When to use try-catch for null pointers in Java?
In Java, we can handle exceptional events using the try-catch. But not all exceptions are the same. Java Null Pointer Exception processing requires using try-catch in a way that is unchecked during compilation. Checked And Unchecked Java Exceptions
When is a NullPointerException thrown in a program?
NullPointerException is thrown when program attempts to use an object reference that has the null value. Invoking a method from a null object. Accessing or modifying a null object’s field. Taking the length of null, as if it were an array. Accessing or modifying the slots of null object, as if it were an array.
Is the object in the catch block null?
Your screenshot clearly shows that the object is not null since you can see the values of its properties. Those properties are all null which is what is confusing you. That’s how exception throwing/handling works. The sample code in the question does not show which specific Exception class is caught and also, what happens within the catch block.
What happens if you throw an exception outside the try block?
However, if you throw the exception from outside the try block, it will not be caught and will be thrown out of the method to the caller. It seems to work fine. Not the answer you’re looking for?