Overloaded Methods Throwing Exception

Overloaded methods CAN declare new or broader checked exceptions. We know that FileNotFoundException is a subclass of IOException and according to the above statement an overloaded method cannot throw a narrower exception. But the below code does not throw a compiler error. How?

Animal.java

Java Code:

package pack1;

import java.io.FileNotFoundException;
import java.io.IOException;
public class Animal{
public void drink(int s) throws IOException
{

}
} mh_sh_highlight_all('java');

[code]....