K&S Chapter 5 q-3

[akash azal]

 

import java.io.*;
class Master {
  String doFileStuff() throws FileNotFoundException { return "a"; }
}
class Slave extends Master {
  public static void main(String[] args) {
    String s = null;
    try { s = new Slave().doFileStuff();
    } catch ( Exception x) {
      s = "b"; }
    System.out.println(s);
  }
  // insert code here
}

 

Which, inserted independently at // insert code here, will compile, and produce the output
b? (Choose all that apply.)
A. String doFileStuff() { return "b"; }
B. String doFileStuff() throws IOException { return "b"; }
C. String doFileStuff(int x) throws IOException { return "b"; }
D. String doFileStuff() throws FileNotFoundException { return "b"; }
E. String doFileStuff() throws NumberFormatException { return "b"; }
F. String doFileStuff() throws NumberFormatException,
FileNotFoundException { return "b"; }

[Henry Wong]

Instead of just regurtitating a mock question, it may be better to explain what you think the answer is, and what you don't understand about the question (or the answer)...

Henry

[akash azal]

why the output showing is options
E &F

what is the logic behind this

[sudipto shekhar]

Henry Wong wrote:Instead of just regurtitating a mock question, it may be better to explain what you think the answer is, and what you don't understand about the question (or the answer)...

Henry

Akash you should try to understand what Henry said, that's for you... as far as your answer...the overridden method can throw any subclass of runtime exception, narrower exception of the type thrown by the superclass method or no exception. Hence the answer E and F

[Bahman Robin]

akash azal wrote:why the output showing is options
E &F

what is the logic behind this

The correct answer is A,E and F.

[sudipto shekhar]

Hello Bahman Dorandish and welcome to javaranch

[Paul Stat]

I think the answer is A,D,E+F

A: Overridden method can throw no exception at all (fewer or narrower)
D: Overridden method can throw same exception
E: Overridden method can throw any unchecked exception.
F: Overridden method can throw any unchecked exception + same exception

[Ganeshkumar cheekati]

yes you are right paul.i am agree with you...

[Apoorv Srivastava]

Yes I too agree with Paul..
The ans is A,D,E,F..