Oracle Exam 1Z0-819 Topic 8 Question 88 Discussion

Actual exam question for Oracle's 1Z0-819 exam

Question #: 88
Topic #: 8

[All 1Z0-819 Questions]

Given:

and

Which two method definitions at line n1 in the Bar class compile? (Choose two.)

Apublic List<Number> foo(Set<String> m) {...}

Bpublic List<Integer> foo(Set<CharSequence> m) {...}

Cpublic List<Integer> foo(TreeSet<String> m) {...}

Dpublic List<Object> foo(Set<CharSequence> m) {...}

Epublic ArrayList<Integer> foo(Set<String> m) {...}

Fpublic ArrayList<Number> foo(Set<CharSequence> m) {...}

Show Suggested Answer

Suggested Answer: C, F

by Malinda at Aug 26, 2024, 06:07 AM

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Tuyet

2 days ago

Haha, whoever came up with these options is trying to trick us. I'm just going to guess and hope for the best.

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Lonna

5 days ago

I think options A and E will compile because they both use the correct parameter types.

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Georgene

9 days ago

Wait, isn't D also correct? Object is a supertype of Integer, so that should compile too.

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Marilynn

10 days ago

The correct answer has to be B and E. The method signature has to use a covariant return type and the parameter type has to be a supertype or subtype of the declared type.

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