How to insert throws in UDF

Hi experts,

just a maybe simple question:

In a UDF is possible to use throws?

When I use "Create a new function" the first row:

public String example(String valueAsString,Container container){

is not modifiable.

my need is to have this:

public String example(String valueAsString, Container container)

                                          throws IllegalArgumentException, NumberFormatException {

Is possible?

Thanks

Fabio