1Z1-816 by Oracle Actual Free Exam Q&As

Question 1

Given:

Which statement is equivalent to line 1?

A. double totalSalary = list.stream().map(e -> e.getSalary() * ratio).reduce (bo).ifPresent (p -> p.doubleValue()); B. double totalSalary = list.stream().map(Employee::getSalary * ratio).reduce (bo).orElse(0.0); C. double totalSalary = list.stream().mapToDouble(e -> e.getSalary() * ratio).sum; D. double totalSalary = list.stream().mapToDouble(e -> e.getSalary() * ratio).reduce(starts, bo);

Discussion 0

Correct Answer: B Vote an answer

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Question 2

Given:

What code must you insert on Line 1 to enable the code to print Hello world?

A. Hello myH = new Hello();
Hello.Greeting myG = myH.new Greeting();
myG.sayHi(); B. Hello.Greeting myG = new Hello.Greeting() myG.sayHi(); C. Hello myH = new Hello(); Greeting myG = new Greeting(); myG.sayHi (); D. Hello myH = new Hello();
Hello.Greeting myG = myH.new Hello.Greeting();
myG.sayHi();

Discussion 0

Correct Answer: A Vote an answer

Question 3

Given:

Which statement on line 1 enables this code to compile?

A. Function f = n -> n * 2; B. Function<Integer> f = n -> n * 2; C. Function<int, int> f = n -> n * 2; D. Function<int> f = n -> n * 2; E. Function<Integer, Integer> f = n -> n * 2;

Discussion 0

Correct Answer: E Vote an answer

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Question 4

Which two statements independently compile? (Choose two.)

A. List<? super Number> list = new ArrayList<Integer>(); B. List<? super Float> list = new ArrayList<Double>(); C. List<? extends Number> list = new ArrayList<Byte>(); D. List<? super Short> list = new ArrayList<Number>(); E. List<? extends Number> list = new ArrayList<Object>();

Discussion 0

Correct Answer: C,D Vote an answer

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Question 5

Which three annotation uses are valid? (Choose three.)

A. Function<String, String> func = (@NonNull var x) -> x.toUpperCase(); B. var v = "Hello" + (@Interned) "World" C. var obj = new @Interned MyObject(); D. Function<String, String> func = (var @NonNull x) -> x.toUpperCase(); E. var myString = (@NonNull String) str; F. Function<String, String> func = (@NonNull x) -> x.toUpperCase();

Discussion 0

Correct Answer: C,D,F Vote an answer

Question 6

Which code fragment prints 100 random numbers?

A. Option D B. Option A C. Option B D. Option C

Discussion 0

Correct Answer: A Vote an answer

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Question 7

Given:

Which statement on line 1 enables this code fragment to compile?

A. UnaryOperator function = s -> s.toUpperCase(); B. Function function = String::toUpperCase; C. UnaryOperator<String> function = String::toUpperCase; D. Function<String> function = m -> m.toUpperCase();

Discussion 0

Correct Answer: C Vote an answer

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Question 8

Which two statements correctly describe capabilities of interfaces and abstract classes? (Choose two.)

A. Interfaces cannot have instance fields but abstract classes can. B. Interfaces cannot have methods with bodies but abstract classes can. C. Interfaces cannot have protected methods but abstract classes can. D. Both interfaces and abstract classes can have final methods. E. Interfaces cannot have static methods but abstract classes can.

Discussion 0

Correct Answer: A,C Vote an answer

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Oracle Java SE 11 Programmer II - 1Z1-816 Exam Practice Test