Implementing Interface methods in implementing class....

[Abimaran Kugathasan]

The throws clauses about Exceptions in the interface's methods must exactly match the throws clauses of the implementing methods. That means, we can't even declare the implemented methods as subclass of that Exception. Please confirm, I got it from a Note. Thanks in Advanced!~

[Abimaran Kugathasan]

In K&B's book, It's said that, A nonabstract implementing class must not declare any new checked exceptions for an implementation method. That means, We can't declare a subclass type Exception in the method declaration. Please confirm!

[Neha Daga]

Its not like that,
always remember overriding methods cannot declare newer or broader checked exceptions.
example:

 Interface A{
void myMethod throws IOException();
}
class B implements A{
// version1
public void myMethod throws IOException(){}
// version 2
public void myMethod throws FileNotFoundException(){}
// version3
public void myMethod throws Exception(){}
// version4
public void myMethod throws somecheckedexception(){}
// version5
public void myMethod throws RunTimeException(){}
}

here version 1,2 and 5 are allowed but version 3 and 4 are not allowed.

[Jeevan Reddy]

Thanks Neha for the clarification.

[Wouter Oet]

An implementation cannot throw new checked exceptions or broader checked exceptions. An implementation can as Neha demonstrated with her example throw a smaller exception (FileNotFoundException vs IOException). Of course can an implementation throw new RuntimeExceptions (lowercase T).

[Abimaran Kugathasan]

Thanks Nega Daga & Wouter Oet. It's clear now. Thanks a lot......