native

[umang bhartia]

Hello every1,
Here is the code
interface One
{
public void someMethod();
}
public class One_impl implements One
{
public native void someMethod();
}
Assuming that the native method is not provided in any local library, an
attempt to compile and run the above lines of code will cause
1. Compilation error - implimentations can never be native.
2. Compilation error - method not found in local libraries.
3. Runtime Exception - method not found in local libraries.
4. Compilation successfull but runtime error is thrown if and only if the
method someMethod of class One_impl is called.

Answer is 4:
I thought that as the interface is extended and its given that the native method is not provided in library, then it would b compiler error. Can any one explain me why the answer is 4

[Paul Anilprem]

When you make a method native, you do not give the implementation and the compiler assumes that the implementation will be available at the runtime. The interface implementation requirement is also satisfied because as far as the compiler is concered, the method is implementated.
So, there is no compile time error.
-Paul.

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