21.2.1. Key Concepts in NIO

Try these first

1. 1.

   What is a buffer in Java NIO?

   Hint

   Think about data types.

2. 2.

   Name a type of channel in Java NIO.

   Hint

   Consider different uses for channels.

3. 3.

   What does a buffer in Java NIO do?

   • Stores metadata
   • Holds data temporarily
   • Transfers data between channels

   Hint

   Consider the role a buffer has during data processing.

4. 4.

   Are selectors used for non-blocking I/O?

   • True
   • False

   Hint

   Think about how selectors affect thread efficiency.

5. 5.

   Design a small Java application that demonstrates the use of buffers and channels by reading a file's content into a buffer and displaying it.

   Hint

   Remember the process: open a file, get the channel, and read into the buffer.

6. 6.

   Explain how you would implement a server that handles multiple client connections using selectors and channels.

   Hint

   Think about the steps needed for non-blocking I/O.