throwing an exception

[Maria Garcia]

if a method in a superclass does NOT throw an exception, and if the subclass overrides the method, can the latter throw an exception ?

[Anthony Villanueva]

No.
Suppose class A has method m() which throws exceptions X, Y and Z.
Suppose class B extends A and overrides m().
Then m() of B can only throw:
1. X, Y, Z (some or all)
2. subclasses of X, Y, Z (some or all)
3. none at all
but m() cannot throw exceptions W or U.

[Valentin Crettaz]

m() (in the subclass) may throw any RuntimeException or Error, though
For more information, please read:
JLS 11.2 Compile-Time Checking of Exceptions
[ July 24, 2002: Message edited by: Valentin Crettaz ]

[Anthony Villanueva]

Yeah I meant checked exceptions X, Y, Z, W or U. Hope it's clear now

[Maria Garcia]

thank you for your help