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

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 a predicate (Boolean-valued function) of two arguments?

A - BiConsumer<T,U>

B - BiFunction<T,U,R>

C - BinaryOperator<T>

D - BiPredicate<T,U>

Answer : D

Explanation

BiPredicate<T,U> functional interface represents a predicate (Boolean-valued function) of two arguments.

Q 3 - Which of the following functional interface represents an operation that accepts a single int-valued argument and returns no result?

A - IntConsumer

B - IntFunction<R>

C - IntPredicate

D - IntSupplier

Answer : A

Explanation

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

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 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 : C

Explanation

Both of the above options are correct.

Q 7 - Which of the following class implements an encoder for encoding byte data using the Base64 encoding scheme in Java8?

A - Base64.Decoder

B - Base64.Encoder

C - Base64Decoder

D - Base64Encoder

Answer : B

Explanation

static class Base64.Encoder - This class implements an encoder for encoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045.

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

A - getDecoder()

B - getEncoder()

C - getMimeDecoder()

D - getMimeEncoder

Answer : B

Explanation

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

Q 9 - Stream supports aggregate operations like filter, map, limit, reduce, find and match.

A - false

B - true

Answer : B

Explanation

Stream supports aggregate operations like filter, map, limit, reduce, find, match, and so on.

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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