The correct answer is: B. last among the catch blocks
A default exception block is a block of code that is executed when an exception is thrown and no other catch block matches the exception. It is always placed last among the catch blocks.
Option A is incorrect because a default exception block can only be placed last among the catch blocks.
Option C is incorrect because a default exception block is not placed globally, at the top of the file. It is placed last among the catch blocks.
Option D is incorrect because a default exception block is not placed at the end of all code in the program. It is placed last among the catch blocks.
Here is an example of a default exception block:
try {
// code that may throw an exception
} catch (IOException e) {
// handle IOException
} catch (SQLException e) {
// handle SQLException
} catch (Exception e) {
// handle all other exceptions
}
In this example, the default exception block will be executed if any of the following exceptions are thrown:
- IOException
- SQLException
- Any other exception that is not IOException or SQLException
I hope this helps! Let me know if you have any other questions.