Role of Exceptions in overriding a method

[Anwar Hussain]

Please some one explain me about the imporatnce of exceptions while overriding a method.Advanced Thanks.

[Sebastian Janisch]

I don't fully get the question, but I suppose you want to know what the contract of exceptions is when overriding a method.

When overriding a method that throws an exception, the overriding method may either throw no exception, or any exception that is the same or a subtype of the original declared exception ...

[Anwar Hussain]

Thanks.

[Anwar Hussain]

Iam using Java 1.6 version.I have one overridden method and one overriding method as shown below.

Overridden method : public void div(int a,int b)throws ArrayIndexOutOfBoundsException
{
System.out.println("Hai this is the super class div method");
}
Overriding method : public void div(int a,int b)throws IndexOutOfBoundsException
{
System.out.println("Hai this is the sub class div method");
}

If you can observe Iam throwing the super class exceptio type in the overridding method(IndexOutOfBoundsException is super class of ArrayIndexOutOfBoundsException) , Still the code is getting compiled and ran.

Iam totally confused.Please help me out.Some one Give me full details.

[Seetharaman Venkatasamy]

Anwar Hussain wrote:
Iam throwing the super class exception type in the overridding method(IndexOutOfBoundsException is super class of ArrayIndexOutOfBoundsException) , Still the code is getting compiled and ran.

that is because of you are throwing the RuntimeException

[Anwar Hussain]

Hi,

You mean to say the rules will not apply to Exceptions of type RuntimeException as compiler will not care about these exceptions.
And one more thing what if the overriden method is throwing multiple exceptions???

[Nishan Patel]

Hi Anwar,

Use [code] tag when you post code with your question.......

Anwar Read this Use Code Tag

[Anwar Hussain]

seetharaman venkatasamy wrote:

Anwar Hussain wrote:
Iam throwing the super class exception type in the overridding method(IndexOutOfBoundsException is super class of ArrayIndexOutOfBoundsException) , Still the code is getting compiled and ran.

that is because of you are throwing the RuntimeException

Hi Swamy,

Thanks alot.Everythin is clear now. Cheers.

[Seetharaman Venkatasamy]

Anwar Hussain wrote:
Hi Swamy,

Thanks alot.Everythin is clear now. Cheers.

you are welcome