re; MindQ test question

[art mudick]

Here is a question from MindQ test
import java.io.*;
class Super
{
int methodOne( int a, long b ) throws IOException
{ // code that performs some calculations
}
float methodTwo( char a, int b )
{ // code that performs other calculations
}
}
public class Sub extends Super
{
}
Which of the following are legal method declarations to add to the class Sub? Assume that each method is
the only one being added.
a) public static void main( String args[] ){}
b) float methodTwo(){}
c) long methodOne( int c, long d ){}
d) int methodOne( int c, long d ) throws ArithmeticException{}
e) int methodOne( int c, long d ) throws FileNotFoundException{}
I chose answer a,b,d and e. Could someone tell me if it right.

[Lucy C]

Answer e is not valid, as an overriding method like this can't throw any checked exceptions that aren't thrown by the method it overrides - and FileNotFoundException is a checked exception.
ArithmeticException is a runtime exception, so d is valid.

[josephine chen]

e is valid becoz FileNotFoundException is a subclass of IOException .U can have the same Exception as in Overridden method or its subclass

[Lucy C]

You're right - I didn't read the code properly. Better not do that in the exam...

[Chuck Lan]

so a is okay, b is okay because it's method overloading. c is not okay because the overriding method has a different return type. d is okay because ArithmeticException is a runtime exception. e is okay because FileNotFoundException is a subclass of IOException.