Java OCA OCP Practice Question 666

Question

Given that FileNotFoundException is a subclass of IOException,

what is the output of the following application? 

package mypkg; /*from   w w w . jav  a  2s.  c o  m*/
import java.io.*; 
public class Main { 
   public void m() { 
      try { 
         throw new IOException("Disk not found"); 
      } catch (Exception e) { 
         try { 
            throw new FileNotFoundException("File not found"); 
         } catch (FileNotFoundException e) {  // z1 
            System.out.print("Failed"); 
         } 
      } 
   } 
   public static void main(String... files) { 
      new Main().m();  // z2 
   } 
}
  • A. Failed
  • B. The application compiles but a stack trace is printed at runtime.
  • C. The code does not compile because of line z1.
  • D. The code does not compile because of line z2. 


C.

Note

While a catch block is permitted to include an embedded try-catch block, the issue here is that the variable name e is already used by the first catch block.

In the second catch block, it is equivalent to declaring a variable e twice.

Line z1 does not compile, and Option C is the correct answer.

If a different variable name was used for either catch block, then the code would compile without issue, and Option A would be the correct answer.




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