Java 8 Online Quiz


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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.

Questions and Answers

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 a function that accepts an int-valued argument and produces a result?

A - IntConsumer

B - IntFunction<R>

C - IntPredicate

D - IntSupplier

Answer : B

Explanation

IntFunction<R> functional interface represents a function that accepts an int-valued argument and produces a result.

Q 4 - Which of the following functional interface represents a supplier of long-valued results?

A - LongConsumer

B - LongFunction<R>

C - LongPredicate

D - LongSupplier

Answer : D

Explanation

LongSupplier functional interface represents a supplier of long-valued results.

Q 5 - Which of the following functional interface represents a function that produces an int-valued result?

A - ToDoubleBiFunction<T,U>

B - ToDoubleFunction<T>

C - ToIntBiFunction<T,U>

D - ToIntFunction<T>

Answer : D

Explanation

ToIntFunction<T> functional interface represents a function that produces an int-valued result.

Answer : D

Explanation

The 'sorted' method is used to sort the stream.

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 - Optional is a container object which is used to contain not-null objects.

A - true

B - false

Answer : A

Explanation

Optional is a container object which is used to contain not-null objects.

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.


java8_questions_answers.htm

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