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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 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 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 an operation on a single int-valued operand that produces an int-valued result?

A - IntToDoubleFunction

B - IntToLongFunction

C - IntUnaryOperator

D - LongBinaryOperator

Answer : C

Explanation

IntUnaryOperator functional interface represents an operation on a single int-valued operand that produces an int-valued result.

Q 5 - Which of the following functional interface represents a function that produces a long-valued result?

A - ToLongBiFunction<T,U>

B - ToLongFunction<T>

C - UnaryOperator<T>

D - ToIntFunction<T>

Answer : B

Explanation

ToLongFunction<T> functional interface represents a function that produces a long-valued result.

Q 6 - What is the purpose of limit method of stream in java 8?

A - Iterate each element of the stream.

B - Map each element to its corresponding result.

C - Eliminate elements based on a criteria

D - Reduce the size of the stream

Answer : D

Explanation

The 'limit' method is used to reduce the size of the stream.

Q 7 - Which of the following class implements an encoder for encoding byte data using the Base64 encoding scheme in Java8?

Answer : B

Explanation

static class Base64.Encoder - This class implements an encoder for encoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045.

Q 8 - Which of the following method of Base64 class returns a Base64.Encoder that encodes using the MIME type base64 encoding scheme?