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Java 8 Online Quiz

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.

Q 1 - Which of the following is correct about System.out::println expression?

A - System.out::println method is a static method reference to println method of out object of System class.

B - System.out::println method is a instance method reference to println method of out object of System class.

C - Both of the above.

D - None of the above.

Answer : A

Explanation

System.out::println method is a static method reference to println method of out object of System class.

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

A - BooleanSupplier

B - Consumer<T>

C - DoubleBinaryOperator

D - DoubleConsumer

Answer : D

Explanation

DoubleConsumer functional interface represents an operation that accepts a single double-valued argument and returns no result.

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

Answer : D

Explanation

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

Q 4 - Which of the following functional interface represents a function that accepts a long-valued argument and produces an int-valued result?

A - LongToDoubleFunction

B - LongToIntFunction

C - LongUnaryOperator

D - ObjDoubleConsumer<T>

Answer : B

Explanation

LongToIntFunction functional interface represents a function that accepts a long-valued argument and produces an int-valued result.

Q 5 - Which of the following functional interface represents a function that produces an int-valued result?

A - ToDoubleBiFunction<T,U>

B - ToDoubleFunction<T>

C - ToIntBiFunction<T,U>

D - ToIntFunction<T>

Answer : D

Explanation

ToIntFunction<T> functional interface represents a function that produces an int-valued result.

Q 6 - Which of the following functional interface represents an operation on a single operand that produces a result of the same type as its operand?

A - ToLongBiFunction<T,U>

B - ToLongFunction<T>

C - UnaryOperator<T>

D - ToIntFunction<T>

Answer : C

Explanation

UnaryOperator<T> functional interface represents an operation on a single operand that produces a result of the same type as its operand.

Q 7 - Which of the following API represents a specialized date-time API to deal with various timezones in java8?

A - Local

B - Zoned

C - Both of the above.

D - None of the above.

Answer : B

Explanation

Zoned − Specialized date-time API to deal with various timezones.

Q 8 - Which of the following method of Base64 class returns a Base64.Encoder that encodes using the MIME type base64 encoding scheme?

Answer : D

Explanation

getMimeEncoder() method of Base64 class returns a Base64.Encoder that encodes using the MIME type base64 encoding scheme.

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 - In which of the following type of Base64 encoding, Output is mapped to a set of characters lying in A-Za-z0-9+/?

A - Simple

B - URL

C - MIME

D - None of the above.

Answer : A

Explanation

Simple − Output is mapped to a set of characters lying in A-Za-z0-9+/.

java8_questions_answers.htm