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

A - DoubleFunction<R>

B - DoublePredicate

C - DoubleSupplier

D - DoubleToIntFunction

Answer : A

Explanation

DoubleFunction<R> functional interface represents a function that accepts a double-valued argument and produces a result.

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

A - IntToDoubleFunction

B - IntToLongFunction

C - IntUnaryOperator

D - LongBinaryOperator

Answer : B

Explanation

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

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

Answer : A

Explanation

LongConsumer functional interface represents an operation that accepts a single long-valued argument and returns no result.

Q 5 - Which of the following functional interface represents a predicate (Boolean-valued function) of one argument?

A - ObjIntConsumer<T>

B - ObjLongConsumer<T>

C - Predicate<T>

D - Supplier<T>

Answer : C

Explanation

Predicate<T> functional interface represents a predicate (Boolean-valued function) of one argument.

Q 6 - What is the purpose of filter 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 : C

Explanation

The 'filter' method is used to eliminate elements based on a criteria.

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.Encoder that encodes using the URL and Filename safe type base64 encoding scheme?

Answer : B

Explanation

getUrlEncoder() method of Base64 class returns a Base64.Encoder that encodes using the URL and Filename safe type base64 encoding scheme.

Q 9 - Stream supports aggregate operations like filter, map, limit, reduce, find and match.

A - false

B - true

Answer : B

Explanation

Stream supports aggregate operations like filter, map, limit, reduce, find, match, and so on.

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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