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 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 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 an int-valued argument and produces a double-valued result?

A - IntToDoubleFunction

B - IntToLongFunction

C - IntUnaryOperator

D - LongBinaryOperator

Answer : A

Explanation

IntPredicate functional interface represents a function that accepts an int-valued argument and produces a double-valued 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 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 - Which of the following is correct about streams in java8?

A - Intermediate operation's function is to take input, process them, and return output to the target.

B - collect() method is a terminal operation which is normally present at the end of the pipelining operation to mark the end of the stream.

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

Q 7 - Can you execute javascript code from java 8 code base?

Answer : A

Explanation

Yes! Using ScriptEngineManager, JavaScript code can be called and interpreted in Java.

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 - Functional interfaces have a single functionality to exhibit.

Answer : B

Explanation

Functional interfaces have a single functionality to exhibit.

Q 10 - The new date-time API in java 8 is immutable and does not have setter methods.

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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