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 a supplier of Boolean-valued results?

A - BooleanSupplier

B - Consumer<T>

C - DoubleBinaryOperator

D - DoubleConsumer

Answer : A

Explanation

BooleanSupplier functional interface represents a supplier of Boolean-valued results.

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

A - DoubleToLongFunction

B - DoubleUnaryOperator

C - Function<T,R>

D - IntBinaryOperator

Answer : A

Explanation

DoubleToLongFunction functional interface represents a function that accepts a double-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 a result?

A - LongConsumer

B - LongFunction<R>

C - LongPredicate

D - LongSupplier

Answer : B

Explanation

LongFunction<R> functional interface represents a function that accepts a long-valued argument and produces a result.

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

A - ObjIntConsumer<T>

B - ObjLongConsumer<T>

C - Predicate<T>

D - Supplier<T>

Answer : A

Explanation

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

Answer : B

Explanation

Using name of the interface.

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 - Functional interfaces have a single functionality to exhibit.

A - false

B - true

Answer : B

Explanation

Functional interfaces have a single functionality to exhibit.

Q 10 - java.util.Date is not thread safe, thus developers have to deal with concurrency issue while using date.

A - true

B - false

Answer : A

Explanation

java.util.Date is not thread safe, thus developers have to deal with concurrency issue while using date.

java8_questions_answers.htm

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