21.2.4. Selectors

Try these first

1. 1.

   What is a selector in Java NIO?

   Hint

   Think about how it improves resource usage.

2. 2.

   Name one reason why non-blocking I/O is beneficial.

   Hint

   Consider how this affects application performance.

3. 3.

   What do selectors allow in Java NIO?

   • Handling only one channel at a time
   • Monitoring multiple channels with a single thread
   • Blocking I/O operations

   Hint

   Consider how this impacts server performance.

4. 4.

   True or False: Selectors block the application from executing while waiting for I/O.

   • True
   • False

   Hint

   Focus on the purpose of non-blocking I/O.

5. 5.

   Design a chat server using Java NIO selectors to handle multiple clients. Explain how you would manage incoming messages and connections.

   Hint

   Consider how you would establish communication between various clients efficiently.

6. 6.

   Describe the performance implications of using selectors over traditional blocking I/O techniques in a server application.

   Hint

   Think about how a fewer number of threads influence server load and responsiveness.