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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.

Questions and Answers

Answer : D

Explanation

All of the above options are correct.

Q 2 - Which of the following functional interface represents an operation upon two operands of the same type, producing a result of the same type as the operands?

A - BiConsumer<T,U>

B - BiFunction<T,U,R>

C - BinaryOperator<T>

D - BiPredicate<T,U>

Answer : C

Explanation

BinaryOperator<T> functional interface represents an operation upon two operands of the same type, producing a result of the same type as the operands.

Q 3 - Which of the following functional interface represents a function that accepts an int-valued argument and produces a long-valued result?

A - IntToDoubleFunction

B - IntToLongFunction

C - IntUnaryOperator

D - LongBinaryOperator

Answer : B

Explanation

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

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 a double-valued result?

A - ToDoubleBiFunction<T,U>

B - ToDoubleFunction<T>

C - ToIntBiFunction<T,U>

D - ToIntFunction<T>

Answer : B

Explanation

ToDoubleFunction<T> functional interface represents a function that produces a double-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.

Answer : D

Explanation

All of the above options are correct.

Q 8 - Which of the following method of Base64 class returns a Base64.Decoder that decodes using the MIME type base64 decoding scheme?

A - getDecoder()

B - getEncoder()

C - getMimeDecoder()

D - getMimeEncoder

Answer : C

Explanation

getMimeDecoder() method of Base64 class returns a Base64.Decoder that decodes using the MIME type base64 decoding scheme.

Q 9 - Stream takes Collections, Arrays, or I/O resources as input source.

A - true

B - false

Answer : A

Explanation

Stream takes Collections, Arrays, or I/O resources as input source.

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 : B

Explanation

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

java8_questions_answers.htm
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