Given: Which modification enables the code fragment to print Happy Journey!?

Question

Options

• AReplace line n1 with public void ride() throws FuelNotAvailException {
• BReplace line n1 with protected void ride() throws Exception {
• CReplace line n2 with void ride() throws Exception {
• DReplace line n2 with private void ride() throws FuelNotAvailException {

• A
  4% (1)
• B
  84% (21)
• C
  8% (2)
• D
  4% (1)

Explanation

Option B works because it declares the parent class's ride() method as protected and declares throws Exception - the broadest checked exception type. This allows the child class's override (at n2) to have equal-or-wider access (public ≥ protected) and throw a narrower checked exception (FuelNotAvailException extends Exception), satisfying both of Java's method overriding rules.

Why A fails: Swapping n1 to throw FuelNotAvailException (a narrow exception) means the child's override cannot throw the broader Exception - overriding methods can only throw the same or narrower checked exceptions, never broader ones.

Why C fails: Changing n2 to package-private (no modifier) is more restrictive than a public or protected parent method - overriding methods must maintain or widen access, never restrict it.

Why D fails: private methods are not inherited and cannot be overridden. The subclass would silently create a brand-new method rather than an override, so polymorphic dispatch would never call it - "Happy Journey!" would never print.

Memory tip: Think "open wider, throw narrower" - when overriding, you can only open the access door (same or wider) and shrink the exception list (same or narrower checked exceptions).

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