Explanations “Top Java Quiz Questions”

What is the output of the following code? (Choose all that apply)

❌ A. 2
❌ B. 4
✅ C. The code will not compile because of line 3.
✅ D. The code will not compile because of line 5.
✅ E. The code will not compile because of line 7.
❌ F. The code will not compile because of line 11.
❌ G. The output cannot be determined from the code provided.

Explanation:
First, the method getTailLength() in the interface HasTail is assumed to be public, since it is part of an interface. The implementation of the method on line 3 is therefore an invalid override, as protected is a more restrictive access modifier than public, so option C is correct. Next, the class Cougar implements an overloaded ver- sion of getTailLength(), but since the declaration in the parent class Puma is invalid, it needs to implement a public version of the method. Since it does not, the declaration of Puma is invalid, so option D is correct. Option E is incorrect, since Puma is marked abstract and cannot be instantiated. The overloaded method on line 11 is declared correctly, so option F is not correct. Finally, as the code has multiple compiler errors, options A, B, and G can be eliminated.

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334 viewsDec 15, 2020 at 20:57

What is the output of the following code? (Choose all that apply)

❌ A. 2
❌ B. 4
✅ C. The code will not compile because of line 3.
✅ D. The code will not compile because of line 5.
✅ E. The code will not compile because of line 7.
❌ F. The code will not compile because of line 11.
❌ G. The output cannot be determined from the code provided.

Explanation:
First, the method getTailLength() in the interface HasTail is assumed to be public, since it is part of an interface. The implementation of the method on line 3 is therefore an invalid override, as protected is a more restrictive access modifier than public, so option C is correct. Next, the class Cougar implements an overloaded ver- sion of getTailLength(), but since the declaration in the parent class Puma is invalid, it needs to implement a public version of the method. Since it does not, the declaration of Puma is invalid, so option D is correct. Option E is incorrect, since Puma is marked abstract and cannot be instantiated. The overloaded method on line 11 is declared correctly, so option F is not correct. Finally, as the code has multiple compiler errors, options A, B, and G can be eliminated.

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