Java Operators

Java Control Statements

Object Oriented Programming

Java Built-in Classes

Java File Handling

Java Error & Exceptions

Java Multithreading

Java Synchronization

Java Networking

Java Collections

Java Interfaces

Java Data Structures

Java Collections Algorithms

Advanced Java

Java Miscellaneous

Java APIs & Frameworks

Java Class References

Java Useful Resources

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

Answer : D

Explanation

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

A - DoubleToLongFunction

B - DoubleUnaryOperator

C - Function<T,R>

D - IntBinaryOperator

Answer : B

Explanation

DoubleUnaryOperator functional interface represents an operation on a single double-valued operand that 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 an operation that accepts an object-valued and a long-valued argument, and returns no result?

A - ObjIntConsumer<T>

B - ObjLongConsumer<T>

C - Predicate<T>

D - Supplier<T>

Answer : B

Explanation

ObjLongConsumer<T> functional interface represents an operation that accepts an object-valued and a long-valued argument, and returns no result.

Answer : C

Explanation

The 'filter' method is used to eliminate elements based on a criteria.

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

A - Base64.Decoder

B - Base64.Encoder

C - Base64Decoder

D - Base64Encoder

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 is the correct lambda expression which add two numbers and return their sum?

A - (int a, int b) -> { return a + b;};

B - (a, b) -> {return a + b;};

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

Q 9 - Stream operations do the iterations internally over the source elements provided.

A - false

B - true

Answer : B

Explanation

Stream operations do the iterations internally over the source elements provided, in contrast to Collections where explicit iteration is required.

Q 10 - In which of the following type of Base64 encoding, Output is mapped to a set of characters lying in A-Za-z0-9+_?

A - Simple

B - URL

C - MIME

D - None of the above.

Answer : B

Explanation

URL − Output is mapped to a set of characters lying in A-Za-z0-9+_.

java8_questions_answers.htm
Advertisements