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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

Answer : C

Explanation

Both 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 a function that accepts an int-valued argument and produces a double-valued result?

A - IntToDoubleFunction

B - IntToLongFunction

C - IntUnaryOperator

D - LongBinaryOperator

Answer : A

Explanation

IntPredicate functional interface represents a function that accepts an int-valued argument and produces a double-valued result.

Q 4 - Which of the following functional interface represents an operation that accepts an object-valued and a double-valued argument, and returns no result?

A - LongToDoubleFunction

B - LongToIntFunction

C - LongUnaryOperator

D - ObjDoubleConsumer<T>

Answer : D

Explanation

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

Q 5 - Which of the following functional interface represents a function that accepts two arguments and produces an int-valued result?

A - ToDoubleBiFunction<T,U>

B - ToDoubleFunction<T>

C - ToIntBiFunction<T,U>

D - ToIntFunction<T>

Answer : C

Explanation

ToIntBiFunction<T,U> functional interface represents a function that accepts two arguments and produces an int-valued result.

Answer : C

Explanation

Both of the above options are correct.

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 - 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 - 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
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