clarification on this Exceptioncode required

[teja dharma]

clarification on this Exceptioncode required//Contents of File AnInterface.java

public interface AnInterface
{
public void methodOne() throws Exception;
}


//Contents of File AnInterfaceImpl.java

public class AnInterfaceImpl implements AnInterface
{
public void methodOne()
{
System.out.println("I will never throw an exception");
}
}


Read the code below carefully.

public class ATest
{
public static void main(String args[])
{
AnInterface ai = new AnInterfaceImpl();
ai.methodOne();
}
}

when i execute this code i got a compiletime error saying unhandled exception by main ,why so ,actually ai.methodOne() is going to call the method in AnInterfaceImpl which is not throwing any Exception if i remove throws Exception i got the output as
"I will never throw an exception" what i was Expecting.

[Vijitha Kumara]

when i execute this code i got a compiletime error saying unhandled exception by main ,why so ,actually ai.methodOne() is going to call the method in AnInterfaceImpl which is not throwing any Exception

But you are calling that method on a "AnInterface" reference which is what matters to the compiler.

[Bob Wheeler]

Because the compiler checks only the reference type not the referred object. So, there is an unhandled exception you get the error.
Try this and you get no error:

 AnInterfaceImpl ai = new AnInterfaceImpl();   

cheers
Bob

I am too slow.