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

A - DoubleFunction<R>

B - DoublePredicate

C - DoubleSupplier

D - DoubleToIntFunction

Answer : D

Explanation

DoubleToIntFunction functional interface represents a function that accepts a double-valued argument and produces an int-valued result.

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

A - LongToDoubleFunction

B - LongToIntFunction

C - LongUnaryOperator

D - ObjDoubleConsumer<T>

Answer : B

Explanation

LongToIntFunction functional interface represents a function that accepts a long-valued argument and produces an int-valued result.

Q 5 - Which of the following functional interface represents a supplier of results?

A - ObjIntConsumer<T>

B - ObjLongConsumer<T>

C - Predicate<T>

D - Supplier<T>

Answer : D

Explanation

Supplier<T> functional interface represents a supplier of results.

Answer : C

Explanation

Both 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) -> 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 - Most of the stream operations return stream itself so that their result can be pipelined.

A - false

B - true

Answer : B

Explanation

Most of the stream operations return stream itself so that their result can be pipelined.

Q 10 - java.util.Date is not thread safe, thus developers have to deal with concurrency issue while using date.

A - true

B - false

Answer : A

Explanation

java.util.Date is not thread safe, thus developers have to deal with concurrency issue while using date.

java8_questions_answers.htm
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