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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 functional interface represents an operation that accepts two input arguments, and returns no result?

A - BiConsumer<T,U>

B - BiFunction<T,U,R>

C - BinaryOperator<T>

D - BiPredicate<T,U>

Answer : A

Explanation

BiConsumer<T,U> functional interface represents an operation that accepts two input arguments, and returns no result.

Q 2 - Which of the following functional interface represents a predicate of one double-valued argument?

A - DoubleFunction<R>

B - DoublePredicate

C - DoubleSupplier

D - DoubleToIntFunction

Answer : B

Explanation

DoublePredicate functional interface represents a predicate (Boolean-valued function) of one double-valued argument.

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

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 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 accepts two arguments and produces a long-valued result?

A - ToLongBiFunction<T,U>

B - ToLongFunction<T>

C - UnaryOperator<T>

D - ToIntFunction<T>

Answer : A

Explanation

ToLongBiFunction<T,U> functional interface represents a function that accepts two arguments and produces a long-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 is correct about Nashorn in java8?

A - With Java 8, Nashorn, a much improved javascript engine is introduced, to replace the existing Rhino.

B - Nashorn provides 2 to 10 times better performance, as it directly compiles the code in memory and passes the bytecode to JVM.

C - Nashorn uses invokedynamics feature, introduced in Java 7 to improve performance

D - All of the above.

Answer : D

Explanation

All of the above options are correct.

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

Answer : D

Explanation

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

Q 9 - A method reference is described using :: (double colon) symbol.

A - false

B - true

Answer : B

Explanation

A method reference is described using :: (double colon) symbol.

Q 10 - The new date-time API in java 8 is immutable and does not have setter methods.

A - true

B - false

Answer : A

Explanation

The new date-time API in java 8 is immutable and does not have setter methods.

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