Re: Inheritance.
Stofdeel wrote:
Hello,
public class MyList extends AbstractList<MyType>
{
...
public boolean add(MyType objMyType) throws Exception
{
...
throw new Exception("...")
}
...
}
This is not allowed because the overriden method does not throw an
exception. Anyway I can accomplish this?
Thanks for any info.
1. Consider whether the condition you want to report is already covered
by one of the exceptions that List add can throw:
UnsupportedOperationException - if the add method is not supported by
this list.
ClassCastException - if the class of the specified element prevents it
from being added to this list.
NullPointerException - if the specified element is null and this list
does not support null elements.
IllegalArgumentException - if some aspect of this element prevents it
from being added to this list.
If it is, declare your method to throw the specific exception, rather
than Exception. Note that you can extend an exception. For example, if
he problem is really an illegal argument, but there is some
supplementary data that some callers could use, extend
IllegalArgumentException. Callers who know about the extra data will be
able to use it. Callers that are just expecting a List will still know
it is an illegal argument.
2. Create a new method, with a different name. You can then have it
throw anything you like, including Exception (though it is MUCH better
to throw a more specific Exception subclass).
3. Create an exception that extends RuntimeException. This is a
potentially dangerous move, because it circumvents the compile time
checks for exception handling.
Patricia