Java 8 Online Quiz


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Following quiz provides Multiple Choice Questions (MCQs) related to Java 8. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Questions and Answers

Q 2 - Which of the following functional interface represents an operation that accepts a single input argument and returns no result?

A - BooleanSupplier

B - Consumer<T>

C - DoubleBinaryOperator

D - DoubleConsumer

Answer : B

Explanation

Consumer<T> functional interface represents an operation that accepts a single input argument and returns no result.

Q 3 - Which of the following functional interface represents a supplier of int-valued results?

A - IntConsumer

B - IntFunction<R>

C - IntPredicate

D - IntSupplier

Answer : D

Explanation

IntPredicate functional interface represents a supplier of int-valued results.

Q 4 - Which of the following functional interface represents an operation upon two long-valued operands and produces a long-valued result?

A - IntToDoubleFunction

B - IntToLongFunction

C - IntUnaryOperator

D - LongBinaryOperator

Answer : D

Explanation

LongBinaryOperator functional interface represents an operation upon two long-valued operands and produces a long-valued result.

Q 5 - Which of the following functional interface represents an operation that accepts an object-valued and a long-valued argument, and returns no result?

A - ObjIntConsumer<T>

B - ObjLongConsumer<T>

C - Predicate<T>

D - Supplier<T>

Answer : B

Explanation

ObjLongConsumer<T> functional interface represents an operation that accepts an object-valued and a long-valued argument, and returns no result.

Q 8 - Which of the following is the correct lambda expression which add two numbers and return their sum?

A - (int a, int b) -> { return a + b;};

B - (a, b) -> {return a + b;};

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

Q 9 - A method reference is described using :: (double colon) symbol.

A - false

B - true

Answer : B

Explanation

A method reference is described using :: (double colon) symbol.

Q 10 - Optional.ofNullable method allows passed parameter to be null.

A - true

B - false

Answer : A

Explanation

Optional.ofNullable method allows passed parameter to be null.


java8_questions_answers.htm

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