public class OverrideThrowsTest {
    public static void main(String[] args)
        // 1
    {
        A a = new A();
        a.method();
        A ab = new B();
        ab.method();
        B b = new B();
        b.method();
    }
}

class A {
    public void method() throws IOException {}
}

class B extends A {
    public void method() throws FileNotFoundException {}
}