What happens if an exception occurs inside the finally block during execution?

If an exception occurs inside a finally block, this exception will be thrown on top of any exceptions that may have occurred in the try or catch blocks. That is, the exception from finally "overrides" the previous one.

Example:

try {
    throw new Exception("Exception from try");
} catch (Exception e) {
    System.out.println("Handling exception: " + e.getMessage());
} finally {
    throw new RuntimeException("Exception from finally");
}

In this case, the program will throw a RuntimeException from finally, and the exception from try will be lost.

This can lead to unexpected behavior and complicate debugging, so it is recommended to avoid throwing exceptions from finally. If you need to handle exceptions in finally, it is better to use a nested try-catch block inside finally.