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Welcome to our Java NIO quiz! In this blog post, we present a set of 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 test your understanding of Java NIO and evaluate your proficiency in working with NIO components.
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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
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.
2. Which package is used for Java NIO?
a) java.io
b) java.nio
c) java.util
d) java.net
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.
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
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.
4. Which class is used to perform non-blocking I/O operations in Java NIO?
a) ByteBuffer
b) Selector
c) Channel
d) InputStream
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.
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
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.
6. Which class is used to perform file I/O operations in Java NIO?
a) FileChannel
b) Buffer
c) Stream
d) Reader
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.
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
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.
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
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.
9. Which interface is used to represent a path in the file system in Java NIO?
a) Path
b) File
c) FileSystem
d) Directory
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.
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
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.
11. Which method in Java NIO is used to allocate a ByteBuffer?
a) ByteBuffer.allocate()
b) ByteBuffer.wrap()
c) ByteBuffer.allocateDirect()
d) ByteBuffer.create()
Answer:
a) ByteBuffer.allocate()
Explanation:
The ByteBuffer.allocate() method is used to allocate a new byte buffer. It allocates space for the buffer in the JVM heap.
12. Which class in Java NIO provides a channel for reading and writing files?
a) FileChannel
b) FileReader
c) FileInputStream
d) FileWriter
Answer:
a) FileChannel
Explanation:
The FileChannel class provides a channel for reading and writing files in Java NIO. It supports reading, writing, mapping, and manipulating files.
13. What is the purpose of a MappedByteBuffer in Java NIO?
a) To map a file into memory
b) To compress data
c) To handle network data
d) To encrypt data
Answer:
a) To map a file into memory
Explanation:
The MappedByteBuffer class is used to map a file into memory. It allows a file to be directly mapped into the memory, providing faster file access.
14. Which method is used to check if a Selector has any channels ready for I/O operations?
a) select()
b) isReady()
c) poll()
d) isAvailable()
Answer:
a) select()
Explanation:
The select() method is used to check if a Selector has any channels ready for I/O operations. It blocks until at least one channel is ready or a timeout occurs.
15. What does the method selector.wakeup() do in Java NIO?
a) Wakes up a blocked selector
b) Closes the selector
c) Resets the selector
d) Initializes the selector
Answer:
a) Wakes up a blocked selector
Explanation:
The wakeup() method is used to wake up a selector that is blocked on the select() method, allowing it to continue processing.
16. Which method is used to register a channel with a selector in Java NIO?
a) channel.register(selector, ops)
b) selector.attach(channel, ops)
c) channel.attach(selector, ops)
d) selector.connect(channel, ops)
Answer:
a) channel.register(selector, ops)
Explanation:
The register() method is used to register a channel with a selector, specifying the operations (like read or write) that the selector should monitor for that channel.
17. What is the difference between a direct and non-direct buffer in Java NIO?
a) Direct buffers are allocated outside the JVM heap, non-direct buffers are inside
b) Direct buffers are faster, non-direct buffers are slower
c) Direct buffers are for file I/O, non-direct buffers are for network I/O
d) Direct buffers are only for character data
Answer:
a) Direct buffers are allocated outside the JVM heap, non-direct buffers are inside
Explanation:
Direct buffers are allocated outside the JVM heap and can provide faster access to native I/O operations, while non-direct buffers are allocated inside the JVM heap.
18. Which method is used to flip a buffer in Java NIO?
a) buffer.flip()
b) buffer.reset()
c) buffer.clear()
d) buffer.compact()
Answer:
a) buffer.flip()
Explanation:
The flip() method is used to prepare a buffer for reading data after writing. It sets the limit to the current position and resets the position to zero.
19. What does the method buffer.clear() do in Java NIO?
a) Clears the buffer contents
b) Resets the buffer position to zero
c) Makes the buffer ready for writing
d) Makes the buffer ready for reading
Answer:
c) Makes the buffer ready for writing
Explanation:
The clear() method in Java NIO prepares the buffer for writing by setting the position to zero and the limit to the buffer’s capacity, effectively discarding any data that was previously stored in the buffer.
20. What is the purpose of the Path class in Java NIO?
a) To represent the location of a file or directory
b) To manipulate file permissions
c) To open a file channel
d) To manage file system operations
Answer:
a) To represent the location of a file or directory
Explanation:
The Path class in Java NIO is used to represent the location of a file or directory in the file system. It provides methods to interact with the file system.
21. What does the Files.exists() method do in Java NIO?
a) Checks if a file or directory exists at a specified path
b) Creates a file or directory if it doesn't exist
c) Deletes a file or directory at a specified path
d) Copies a file or directory to a new location
Answer:
a) Checks if a file or directory exists at a specified path
Explanation:
The Files.exists() method checks if a file or directory exists at a specified path. It returns a boolean value indicating the existence of the file or directory.
22. What is the purpose of the Files.copy() method in Java NIO?
a) To copy a file or directory to a new location
b) To move a file or directory
c) To delete a file or directory
d) To create a symbolic link
Answer:
a) To copy a file or directory to a new location
Explanation:
The Files.copy() method is used to copy a file or directory to a new location in the file system.
23. Which method in Java NIO is used to delete a file or directory?
a) Files.delete()
b) Files.remove()
c) Files.erase()
d) Files.unlink()
Answer:
a) Files.delete()
Explanation:
The Files.delete() method is used to delete a file or directory from the file system.
24. What is the purpose of the Files.move() method in Java NIO?
a) To move a file or directory to a new location
b) To copy a file or directory
c) To delete a file or directory
d) To create a symbolic link
Answer:
a) To move a file or directory to a new location
Explanation:
The Files.move() method is used to move a file or directory from one location to another in the file system.
25. What does the Files.createDirectory() method do in Java NIO?
a) Creates a new directory
b) Deletes an existing directory
c) Renames an existing directory
d) Copies an existing directory
Answer:
a) Creates a new directory
Explanation:
The Files.createDirectory() method is used to create a new directory in the file system at the specified path.
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.
Learn and Master Java Programming: Learn Java Programming with Examples
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.
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