Exam 1z0-819 topic 1 question 55 discussion

Actual exam question from Oracle's 1z0-819

Question #: 55
Topic #: 1

[All 1z0-819 Questions]

Given:

Which statement on line 1 enables this code to compile?

A. Consumer function = (String f) -> (System.out.println(f);};
B. Supplier function = () -> fruits.get (0);
C. Predicate function = a -> a.equals("banana");
D. Function function = x -> x.substring(0,2);

Show Suggested Answer

Suggested Answer: A 🗳️

by Ankit1010 at Feb. 5, 2023, 9:09 p.m.

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ASPushkin

1 year ago

Selected Answer: A

answer: A List forEach default void forEach(Consumer<? super T> action) There is syntax error with parentheses and generic type. it should be this way Consumer function = f->{System.out.println(f);}; or Consumer<String> function = f->{System.out.println(f);};

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Galen86

1 year, 5 months ago

In fact, the above answers are all wrong A seems correct, but the writing in lambda is wrong If rewritten as # Consumer function = s -> System.out.println(s); to compile normally

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d7bb0b2

1 year, 8 months ago

A is correct cause foreach accept consumer interface

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d7bb0b2

1 year, 7 months ago

NOTICE: A is the correct but consumer is bad implement in the option because explicit paramater for lambda is (String f)->... and the compiler expect Object, the correct is : 1- Consumer x = x -> System.out.print(x) or: 2- Consumer<String> x = (String f) -> ..... o 3- Consumer<String> x= f -> sout...

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[Removed]

1 year, 11 months ago

Actually answer A is also incorrect. As Consumer is actually Consumer<Object> so it expects an Object rather than a String. It would've worked if it were: f -> System.out.println(f);

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