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Exam 1z0-819 topic 1 question 59 discussion

Actual exam question from Oracle's 1z0-819
Question #: 59
Topic #: 1
[All 1z0-819 Questions]

Given:



Why does D cause a compilation error?

  • A. D does not define any method.
  • B. D inherits a() only from C.
  • C. D inherits a() from B and C but the return types are incompatible.
  • D. D extends more than one interface.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by Ankit1010 at Feb. 2, 2023, 6:12 p.m.

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ASPushkin
11 months, 2 weeks ago
Selected Answer: C
Compilation error : types C and B are incompatible; both define a(), but with unrelated return types a() in C and B should have co-variant return type is based on Liskov substitution principle. Lets say types Collection and ArrayList will be co-variant
upvoted 1 times
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tmuralimanohar
2 years ago
Answer: C
upvoted 1 times
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Stavok
2 years, 1 month ago
Selected Answer: C
C is correct The return types are incompatible for the inherited methods B.a(), C.a()
upvoted 1 times
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RP384
2 years, 5 months ago
Selected Answer: C
C is correct
upvoted 1 times
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Ankit1010
2 years, 5 months ago
C is the correct option
upvoted 2 times
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C (25%)
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