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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 Java 8 lambda expression?

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

B - Lambda expression throws a compilation error, if a variable is assigned a value the second time.

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

Q 2 - Which of the following functional interface represents a function that accepts a double-valued argument and produces a result?

A - DoubleFunction<R>

B - DoublePredicate

C - DoubleSupplier

D - DoubleToIntFunction

Answer : A

Explanation

DoubleFunction<R> functional interface represents a function that accepts a double-valued argument and produces a 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 on a single long-valued operand that produces a long-valued result?

A - LongToDoubleFunction

B - LongToIntFunction

C - LongUnaryOperator

D - ObjDoubleConsumer<T>

Answer : C

Explanation

LongUnaryOperator functional interface represents an operation on a single long-valued operand that 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>