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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 a result?

A - BiConsumer<T,U>

B - BiFunction<T,U,R>

C - BinaryOperator<T>

D - BiPredicate<T,U>

Answer : B

Explanation

BiFunction<T,U> functional interface represents an operation that accepts two input arguments, and returns a result.

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

A - DoubleToLongFunction

B - DoubleUnaryOperator

C - Function<T,R>

D - IntBinaryOperator

Answer : A

Explanation

DoubleToLongFunction functional interface represents a function that accepts a double-valued argument and produces a long-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 an operation that accepts an object-valued and a long-valued argument, and returns no result?

A - ObjIntConsumer<T>

B - ObjLongConsumer<T>

C - Predicate<T>

D - Supplier<T>

Answer : B

Explanation

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

Q 6 - Which of the following is correct about streams in java8?

A - Intermediate operation's function is to take input, process them, and return output to the target.

B - collect() method is a terminal operation which is normally present at the end of the pipelining operation to mark the end of the stream.

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

Q 7 - Can you execute javascript code from java 8 code base?

A - true

B - false

Answer : A

Explanation

Yes! Using ScriptEngineManager, JavaScript code can be called and interpreted in Java.

Q 8 - Using lambda expression, you can refer to final variable or effectively final variable (which is assigned only once).

A - false

B - true

Answer : B

Explanation

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

Q 9 - A stream provides a set of elements of specific type in a sequential manner.

A - true

B - false

Answer : A

Explanation

A stream provides a set of elements of specific type in a sequential manner. A stream gets/computes elements on demand. It never stores the elements.

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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