Discord

Question 1

InputStreamReader

Answer 1

• Bridge from byte streams to char streams
• Reads bytes and decodes them into characters using the specified charset
• Should always be wrapped in a BufferedReader

Question 2

what does the server socket do?

Answer 2

listens for connections on the specified port
new ServerSocket(port);

Question 3

how does a ServerSocket accept a connection from a client Socket?

Answer 3

Socket clientSocket = serverSocket.accept()

Question 4

PrintWriter

Answer 4

wraps an output stream
new PrintWriter(outputStream)
automatic line flushing
can’t write raw bytes

Question 5

What 5 things do you need to implement a ChatServer?

Answer 5

• ServerSocket
• Socket clientSocket
• BufferedReader in
• PrintWriter out
• Scanner to read from keyboard

Question 6

Runnable

Answer 6

A class that implements Runnable can run without subclassing Thread by instantiating a Thread instance and passing itself in as the target.

Question 7

what does scanner take as a param?

Answer 7

System.in

Question 8

checklist

Answer 8

start threads
close sockets
update loop variables

Question 9

difference between streams and readers

Answer 9

stream work with binary data and readers work with characters

Question 10

DataInputStream

Answer 10

read primitive java data types in machine-independent way