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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

Q 1 - Which of the following is correct about Java8?

A - Lambda expression - Adds functional processing capability to Java.

B - Method references - Referencing functions by their names instead of invoking them directly. Using functions as parameter.

C - Default method - Interface to have default method implementation.

D - All of the above.

Answer : D

Explanation

All of the above options are correct.

Q 2 - Which of the following functional interface represents a supplier of double-valued results?

A - DoubleFunction<R>

B - DoublePredicate

C - DoubleSupplier

D - DoubleToIntFunction

Answer : C

Explanation

DoubleSupplier functional interface represents a supplier of double-valued results.

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 a function that produces a long-valued result?

A - ToLongBiFunction<T,U>

B - ToLongFunction<T>

C - UnaryOperator<T>

D - ToIntFunction<T>

Answer : B

Explanation

ToLongFunction<T> functional interface represents a function that produces a long-valued result.

Q 6 - How will you call a default method of an interface in a class?

A - Using super keyword along with interface name.

B - Using name of the interface.

C - Both of the above.

D - None of the above.

Answer : A

Explanation

Using super keyword along with interface name.

Q 7 - Which of the following is correct about Optional in java8?

A - Optional is a container object which is used to contain not-null objects.

B - Optional object is used to represent null with absent value.

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

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

A - getDecoder()

B - getEncoder()

C - getMimeDecoder()

D - getMimeEncoder

Answer : A

Explanation

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

Q 9 - Stream operations do the iterations internally over the source elements provided.

Answer : B

Explanation

Stream operations do the iterations internally over the source elements provided, in contrast to Collections where explicit iteration is required.

Q 10 - Optional.get method gets the value, value should be present.

Answer : B

Explanation

Optional.get method gets the value, value should be present.

java8_questions_answers.htm

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