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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 Java8?

A - New compiler tools and utilities are added like 'jdeps' to figure out dependencies.

B - New stream API to facilitate pipeline processing is added.

C - New Improved date time API added.

D - All of the above.

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 an operation upon two int-valued operands and produces an int-valued result?

A - DoubleToLongFunction

B - DoubleUnaryOperator

C - Function<T,R>

D - IntBinaryOperator

Answer : D

Explanation

FunctionIntBinaryOperator functional interface represents an operation upon two int-valued operands and produces an int-valued result.

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

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 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 - What is the purpose of map method of stream in java 8?

A - Iterate each element of the stream.

B - Map each element to its corresponding result.

C - Eliminate elements based on a criteria

D - Reduce the size of the stream

Answer : B

Explanation

The 'map' method is used to map each element to its corresponding result.

Q 7 - Which of the following class implements a decoder for decoding byte data using the Base64 encoding scheme in Java8?

Answer : A

Explanation

static class Base64.Decoder - This class implements a decoder for decoding 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.Decoder that decodes using the Basic type base64 encoding scheme?

Answer : A

Explanation

getDecoder() method of Base64 class returns a Base64.Decoder that decodes using the Basic type base64 encoding scheme.

Q 9 - Most of the stream operations return stream itself so that their result can be pipelined.

A - false

B - true

Answer : B

Explanation

Most of the stream operations return stream itself so that their result can be pipelined.

Q 10 - Optional.orElse method returns the value if present otherwise returns the default value passed.

A - false

B - true

Answer : B

Explanation

Optional.orElse method returns the value if present otherwise returns the default value passed.

java8_questions_answers.htm