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 1 - Which of the following functional interface represents an operation that accepts two input arguments, and returns no result?

A - BiConsumer<T,U>

B - BiFunction<T,U,R>

C - BinaryOperator<T>

D - BiPredicate<T,U>

Answer : A

Explanation

BiConsumer<T,U> functional interface represents an operation that accepts two input arguments, and returns no result.

Q 2 - Which of the following functional interface represents a supplier of Boolean-valued results?

A - BooleanSupplier

B - Consumer<T>

C - DoubleBinaryOperator

D - DoubleConsumer

Answer : A

Explanation

BooleanSupplier functional interface represents a supplier of Boolean-valued results.

Q 3 - Which of the following functional interface represents a predicate (Boolean-valued function) of one int-valued argument?

A - IntConsumer

B - IntFunction<R>

C - IntPredicate

D - IntSupplier

Answer : C

Explanation

IntPredicate functional interface represents a predicate (Boolean-valued function) of one int-valued argument.

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

A - ToDoubleBiFunction<T,U>

B - ToDoubleFunction<T>

C - ToIntBiFunction<T,U>

D - ToIntFunction<T>

Answer : C

Explanation

ToIntBiFunction<T,U> functional interface represents a function that accepts two arguments and produces an int-valued result.

Q 8 - Which of the following is the correct lambda expression which add two numbers and return their sum?

A - (int a, int b) -> a + b;

B - (a, b) -> a + b

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

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 - Optional.get method gets the value, value should be present.

A - false

B - true

Answer : B

Explanation

Optional.get method gets the value, value should be present.


java8_questions_answers.htm

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