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Exam 1z0-819 topic 1 question 187 discussion

Actual exam question from Oracle's 1z0-819
Question #: 187
Topic #: 1
[All 1z0-819 Questions]

Which is a valid statement?

  • A. BiPredicate testEquality = (var x, Integer y) -> (x.equals(y));
  • B. BiPredicate testEquality = (var x, var y) -> (x.equals(y));
  • C. BiPredicate testEquality = var x, var y -> (x.equals(y));
  • D. BiPredicate testEquality = (var x, y) -> (x.equals(y));
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Suggested Answer: B 🗳️
by d7bb0b2 at Jan. 5, 2024, 12:14 a.m.

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ASPushkin
6 months, 2 weeks ago
similar to 22, 204
upvoted 1 times
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ASPushkin
6 months, 2 weeks ago
Selected Answer: B
A) there is no mix var with the explicit types B) ok C) syntax error without brackets D) compound not allowed
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d7bb0b2
7 months ago
B: Bcos Bipredicated is declared without type and then cannot pass other Type that Object
upvoted 1 times
ASPushkin
6 months, 2 weeks ago
For backward compatibility, assigning a parameterized type to its raw type is allowed. BiPredicate is a raw type from generic type BiPredicate<T,U> where T and U substitute to Object. So it could be any type inherited from Object type.
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