Given: import java.io.*; public class Tester { public static void main(String[] args) { try { doA(); } catch(IOException e) { System.out.print("c"); } finally{ System.out.print("d"); } } private…

The correct answer is E. acd. Option E (acd) is not actually the correct answer - there appears to be an error in the provided answer key. Let me explain what the code actually does. The real answer is A: compilation fails. The catch(IOException e) block is a compile-time error. Java's JLS §11.2.3 prohibits…

Exception Handling

Question

Given: import java.io.*;
public class Tester {
public static void main(String[] args) {
try {
doA();
}
catch(IOException e) {
System.out.print("c");
}
finally{
System.out.print("d");
}
}
private static void doA() {
System.out.print("a");
if (false) {
throw new IndexOutOfBoundsException();
}
}
private static void doB() throws FileNotFoundException {
System.out.print("b");
if (true) {
throw new FileNotFoundException();
}
}
}
What is the result?

Options

AThe compilation fails
Babcd
Cadf
Dad
Eacd

How the community answered

(39 responses)

A
3% (1)
B
3% (1)
C
10% (4)
D
5% (2)
E
79% (31)

Explanation

Option E (acd) is not actually the correct answer - there appears to be an error in the provided answer key. Let me explain what the code actually does.

The real answer is A: compilation fails.

The catch(IOException e) block is a compile-time error. Java's JLS §11.2.3 prohibits catching a checked exception if the try block provably cannot throw it - and IOException is not Exception or a supertype, so no exemption applies. doA() declares no checked exceptions and throws only an IndexOutOfBoundsException (unchecked) that is dead anyway (if (false)), so the catch(IOException e) is unreachable and illegal. javac produces: "exception IOException is never thrown in body of corresponding try statement."

Why the other choices are wrong:

Choice	Why wrong
B (abcd)	`doB()` is never called; "b" is never printed
C (adf)	No "f" exists anywhere in the code
D (ad)	Would be correct if the code compiled - `doA()` prints "a", no exception is thrown, catch is skipped, finally prints "d" - but it doesn't compile
E (acd)	Would require `IOException` to be caught, which can't happen; also irrelevant since compilation fails first

Memory tip: In Java, catch(CheckedException) is a compile error if the try block can't throw it - Java makes you prove the exception is possible, not just possible in theory. The shortcut: catch(Exception e) or catch(Throwable e) are always legal; anything more specific requires the try block to actually declare or throw it.

Topics

#try-catch-finally#exception handling#control flow#IOException

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