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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.

Questions and Answers

Q 1 - Which of the following is correct about Java 8 lambda expression?

A - Optional type declaration - No need to declare the type of a parameter. The compiler can inference the same from the value of the parameter.

B - Optional parenthesis around parameter - No need to declare a single parameter in parenthesis. For multiple parameters, parentheses are required.

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 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 supplier of int-valued results?

A - IntConsumer

B - IntFunction<R>

C - IntPredicate

D - IntSupplier

Answer : D

Explanation

IntPredicate functional interface represents a supplier of int-valued results.

Q 4 - Which of the following functional interface represents an operation that accepts a single long-valued argument and returns no result?

A - LongConsumer

B - LongFunction<R>

C - LongPredicate

D - LongSupplier

Answer : A

Explanation

LongConsumer functional interface represents an operation that accepts a single long-valued argument and returns no result.

Q 5 - Which of the following functional interface represents a predicate (Boolean-valued function) of one argument?

A - ObjIntConsumer<T>

B - ObjLongConsumer<T>

C - Predicate<T>

D - Supplier<T>

Answer : C

Explanation

Predicate<T> functional interface represents a predicate (Boolean-valued function) of one argument.

Q 6 - How will you call a default method of an interface in a class?

A - Using super keyword along with interface name.

B - Using name of the interface.

C - Both of the above.

D - None of the above.

Answer : A

Explanation

Using super keyword along with interface name.

Q 7 - Which of the following API represents a simplified date-time API with no complexity of timezone handling in java8?

C - Both of the above.

D - None of the above.

Answer : A

Explanation

Local − Simplified date-time API with no complexity of timezone handling.

Q 8 - Which of the following method of Base64 class returns a Base64.Decoder that decodes using the Basic type base64 encoding scheme?

A - getDecoder()

B - getEncoder()

C - getMimeDecoder()

D - getMimeEncoder

Answer : A

Explanation

getDecoder() method of Base64 class returns a Base64.Decoder that decodes using the Basic type base64 encoding scheme.

Q 9 - Optional is a container object which is used to contain not-null objects.

Answer : A

Explanation

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

Q 10 - Optional.get method gets the value, value should be present.

Answer : B

Explanation

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

java8_questions_answers.htm

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