Explanations “Top Java Quiz Questions”

What is the output of the code?

❌ A. 2
❌ B. 4
❌ C. 6
❌ D. The code will not compile because of line 5
✅ E. The code will not compile because of line 6
❌ F. The code will not compile because of line 8

Explanation:
The code doesn’t compile because line 6 contains an incompatible override of the getNumberOfGills(int input) method defined in the Aquatic interface. In particular, int and String are not covariant returns types, since int is not a subclass of String.
Note that line 5 compiles without issue; getNumberOfGills() is an overloaded method that is not related to the parent interface method that takes an int value.

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498 viewsJul 2, 2021 at 09:44

What is the output of the code?

❌ A. 2
❌ B. 4
❌ C. 6
❌ D. The code will not compile because of line 5
✅ E. The code will not compile because of line 6
❌ F. The code will not compile because of line 8

Explanation:
The code doesn’t compile because line 6 contains an incompatible override of the getNumberOfGills(int input) method defined in the Aquatic interface. In particular, int and String are not covariant returns types, since int is not a subclass of String.
Note that line 5 compiles without issue; getNumberOfGills() is an overloaded method that is not related to the parent interface method that takes an int value.

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