Java NIO Quiz - MCQ - Multiple Choice Questions

Welcome to our Java NIO quiz! In this blog post, we present a set of ten Multiple Choice Questions (MCQs) to test your knowledge of Java NIO (New Input/Output) concepts. 

Java NIO provides a non-blocking I/O model with enhanced performance and scalability. Let's put your understanding of Java NIO to the test and evaluate your proficiency in working with NIO components. 

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The answer and explanation of each question have given at the end of this post.

1. What does NIO stand for in Java? 

a) New Input/Output 

b) Non-Blocking I/O 

c) Network Input/Output 

d) None of the above 

2.  Which package is used for Java NIO? 

a) java.io 

b) java.nio 

c) java.util 

d) java.net 

3. What is the key concept behind Java NIO? 

a) Thread-per-connection model 

b) Event-driven architecture 

c) Blocking I/O operations 

d) Synchronous I/O 

4. Which class is used to perform non-blocking I/O operations in Java NIO? 

a) ByteBuffer 

b) Selector 

c) Channel 

d) InputStream 

5. What is the purpose of a Selector in Java NIO? 

a) To read data from a file 

b) To write data to a file 

c) To monitor multiple channels for I/O events 

d) To manage file system operations 

6. Which class is used to perform file I/O operations in Java NIO? 

a) FileChannel 

b) Buffer 

c) Stream 

d) Reader 

7. What is a ByteBuffer in Java NIO? 

a) A buffer for storing data 

b) A channel for reading from or writing to files 

c) A selector for monitoring multiple channels 

d) A class for handling character-based I/O operations 

8. What is the purpose of a Channel in Java NIO? 

a) To represent a file or directory 

b) To provide a stream-oriented approach for I/O 

c) To perform file system operations 

d) To read from or write to a data source or destination 

9. Which interface is used to represent a path in the file system in Java NIO? 

a) Path 

b) File 

c) FileSystem 

d) Directory 

10. What is the main advantage of Java NIO over traditional IO? 

a) Better performance and scalability 

b) Simplicity and ease of use 

c) Compatibility with legacy systems 

d) Platform independence 

Answers and Explanations

Question 1

Answer:

a) New Input/Output 

Explanation:

Java NIO stands for New Input/Output. It is an alternative I/O API in Java, providing improved performance and scalability. 

Question 2

Answer:

b) java.nio 

Explanation:

The java.nio package is used for Java NIO. It contains classes and interfaces for non-blocking I/O, buffers, channels, and selectors

Question 3

Answer:

b) Event-driven architecture 

Explanation:

The key concept behind Java NIO is an event-driven architecture. Instead of using a thread-per-connection model, NIO allows multiple channels to be monitored and handled by a single thread. 

Question 4

Answer:

b) Selector 

Explanation:

The Selector class is used to perform non-blocking I/O operations in Java NIO. It allows efficient monitoring of multiple channels for I/O events using a single thread.

Question 5

Answer:

c) To monitor multiple channels for I/O events 

Explanation:

The purpose of a Selector in Java NIO is to monitor multiple channels for I/O events. It enables efficient I/O multiplexing by selecting channels ready for reading, writing, or connection events.

Question 6

Answer:

a) FileChannel 

Explanation:

The FileChannel class is used to perform file I/O operations in Java NIO. It provides methods for reading from, writing to, and manipulating files using a channel-based approach.

Question 7

Answer:

a) A buffer for storing data 

Explanation:

A ByteBuffer in Java NIO is a buffer for storing data. It allows efficient reading from and writing to channels. ByteBuffers can be used for reading and writing binary data.

Question 8

Answer:

d) To read from or write to a data source or destination 

Explanation:

The purpose of a Channel in Java NIO is to read from or write to a data source or destination. It provides a two-way flow of data and supports both reading from and writing to the data source or destination.

Question 9

Answer:

a) Path 

Explanation:

The Path interface is used to represent a path in the file system in Java NIO. It provides methods for manipulating and resolving file paths, accessing file attributes, and performing file system operations.

Question 10

Answer:

a) Better performance and scalability 

Explanation:

The main advantage of Java NIO over traditional IO is better performance and scalability. NIO allows non-blocking I/O operations, enabling efficient handling of multiple connections with fewer threads, leading to improved performance and resource utilization.

Conclusion

Congratulations on completing our Java NIO quiz! We hope you found it informative and enjoyed testing your knowledge of Java NIO concepts. Java NIO provides enhanced capabilities for handling I/O operations with improved performance and scalability. 

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Check out 100+ quiz questions: 100+ Quiz Questions to Test Your Java, Spring Boot, Microservices, Hibernate, REST API Skills

Keep exploring and practicing Java NIO to strengthen your skills and become proficient in working with non-blocking I/O, channels, buffers, and selectors.