I am puzzled about creating checked exception class
in java.
Many article says custom exception can be created by
class MyException extends Exception
{
//constructor defined
}
Since RuntimeException is also inherited from Exception
class.
Is it not possible to create a class that will cover only Checked Exceptions ?
Or I need to specify list of checked exceptions
class MyException extends IOException
{
//constructor defined
}
In above code, there can be a scenario where i would miss certain checked exceptions.
This:
is simply not possible in Java. A class can only extend one other class.
The point is:
That is all there is to this. And yes, you are correct, it is a bit awkward that
RuntimeException extends Exception
but is not a checked exception. But this fact is basically "baked" into the Java language, and there is nothing you can do about that (besides knowing and accepting).And as you updated your question - when you do:
then you create a checked exception that is also an IOException! So to be precise: when you extend
Exception
, or any of the subclasses obException
(except RuntimeException) you are creating a checked exception!