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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 Java 8 lambda expression?

A - Using lambda expression, you can refer to final variable or effectively final variable (which is assigned only once).

B - Lambda expression throws a compilation error, if a variable is assigned a value the second time.

C - Both of the above.

D - None of the above.

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 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 an operation on a single long-valued operand that produces a long-valued result?

A - LongToDoubleFunction

B - LongToIntFunction

C - LongUnaryOperator

D - ObjDoubleConsumer<T>

Answer : C

Explanation

LongUnaryOperator functional interface represents an operation on a single long-valued operand that produces a long-valued result.

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

A - ToDoubleBiFunction<T,U>

B - ToDoubleFunction<T>

C - ToIntBiFunction<T,U>

D - ToIntFunction<T>

Answer : A

Explanation

ToDoubleBiFunction<T,U> functional interface represents a function that accepts two arguments and produces a double-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 API represents a simplified date-time API with no complexity of timezone handling in java8?

A - Local

B - Zoned

C - Both of the above.

D - None of the above.

Answer : A

Explanation

Local − Simplified date-time API with no complexity of timezone handling.

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 - Functional interfaces have a single functionality to exhibit.

A - false

B - true

Answer : B

Explanation

Functional interfaces have a single functionality to exhibit.

Q 10 - In which of the following type of Base64 encoding, Output is mapped to MIME friendly format?

A - Simple

B - URL

C - MIME

D - None of the above.

Answer : C

Explanation

MIME − Output is mapped to MIME friendly format. Output is represented in lines of no more than 76 characters each, and uses a carriage return ' ' followed by a linefeed ' ' as the line separator. No line separator is present to the end of the encoded output.

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