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 1 - Which of the following functional interface represents an operation that accepts two input arguments, and returns a result?

A - BiConsumer<T,U>

B - BiFunction<T,U,R>

C - BinaryOperator<T>

D - BiPredicate<T,U>

Answer : B

Explanation

BiFunction<T,U> functional interface represents an operation that accepts two input arguments, and returns a result.

Q 2 - Which of the following functional interface represents an operation that accepts a single input argument and returns no result?

A - BooleanSupplier

B - Consumer<T>

C - DoubleBinaryOperator

D - DoubleConsumer

Answer : B

Explanation

Consumer<T> functional interface represents an operation that accepts a single input argument and returns no result.

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

A - IntConsumer

B - IntFunction<R>

C - IntPredicate

D - IntSupplier

Answer : B

Explanation

IntFunction<R> functional interface represents a function that accepts an int-valued argument and produces a 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 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.

Answer : A

Explanation

Stream has provided a new method 'forEach' to iterate each element of the stream.

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

A - true

B - false

Answer : B

Explanation

Optional object is used to represent null with absent value.

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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