help

[Sayed]

one class can implement multiple interfaces but it can't extend two calsses why??????

[Eranga]

Multiple inheritance, means one class directly can't extend two classes.

[Sayed]

i want the exact reason for that??..what will be the problem if one class extends multiple calsses directly...one class can implement multiple interfaces directly right...

[Eranga]

That is because to avoid dangers like ambiguity that is present in C++, you may know.

[Sayed]

Thanks for your respone ......could you please brief me on that????what danger it is????

[Eranga]

Oh dear, say ClassA extend from ClassB and ClassC. Say ClassB has a method sampleMethod() and ClassC has sampleMethod(), which method ClassA should call. Compiler really mess-up with it.

That's why SUNs' avoid this. So you can simply use interfaces. As I said there is a trick for multiple inheritance also.

[Sayed]

Thanks yaar...Thanks a lot for your help...

[Eranga]

Is that clear for you. If the question is solved don't forget what I say

[Sayed]

But what about interfaces???if two interfaces contains same method compiler won't mess-up...

[Eranga]

Did you try it?

[Sayed]

yes i tried it...it is not showing any compilation problem but the actual implemented method is not executing...could u please help me on this....

[Eranga]

What you mean actual implemented method is not executing. I'm not clear with it. Do you have any code with you.

[Sayed]

Sorry Its executing it is not showing any problems.

[Eranga]

Ok, so you overloading methods, right?

[Sayed]

Please have a look on this code:

public class Test implements Sample1,Sample2{
public static void main(String args[]){
System.out.println("public static void main");
Test t=new Test();
t.jen();
}
public void jen() {
System.out.println("Success");

}

}

Interface 1:

ublic interface Sample1 {

public void jen();


}

Interface:2


public interface Sample2 {
public void jen();

}