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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 an operation upon two double-valued operands and producing a double-valued result?

A - BooleanSupplier

B - Consumer<T>

C - DoubleBinaryOperator

D - DoubleConsumer

Answer : C

Explanation

DoubleBinaryOperator functional interface represents an operation upon two double-valued operands and producing a double-valued result.

Q 3 - Which of the following functional interface represents an operation on a single double-valued operand that produces a double-valued result?

A - DoubleToLongFunction

B - DoubleUnaryOperator

C - Function<T,R>

D - IntBinaryOperator

Answer : B

Explanation

DoubleUnaryOperator functional interface represents an operation on a single double-valued operand that produces a double-valued result.

Q 4 - Which of the following functional interface represents an operation upon two long-valued operands and produces a long-valued result?

A - IntToDoubleFunction

B - IntToLongFunction

C - IntUnaryOperator

D - LongBinaryOperator

Answer : D

Explanation

LongBinaryOperator functional interface represents an operation upon two long-valued operands and produces a long-valued result.

Q 5 - Which of the following functional interface represents an operation that accepts an object-valued and an int-valued argument, and returns no result?

A - ObjIntConsumer<T>

B - ObjLongConsumer<T>

C - Predicate<T>

D - Supplier<T>

Answer : A

Explanation

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

Q 6 - How will you call a static 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 : B

Explanation

Using name of the interface.

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 is the correct lambda expression which add two numbers and return their sum?

A - (int a, int b) -> { return a + b;};

B - (a, b) -> {return a + b;};

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

Q 9 - Stream operations do the iterations internally over the source elements provided.

A - false

B - true

Answer : B

Explanation

Stream operations do the iterations internally over the source elements provided, in contrast to Collections where explicit iteration is required.

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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