Can single String contain multiple lines?

Question

For example if I assign multiple lines to a string as so:

while ((line = reader.readLine()) != null)
        {
            output += line + \"\\n\";
        }


        

Answer 1

why not just move this to outside the while loop?

    System.out.print("Enter your choice: ");
    fromClient = stdIn.readLine().trim();

Answer 2

There is another mistake in code: while ((fromServer = input.readLine())+"\n" != null). It will be always true. You should only check: while ((fromServer = input.readLine()) != null).

Also if I understand your requirements correctly, your code should be something like below:

String fromServer = "";
String line;
while ((line = input.readLine()) != null) {
    fromServer += line + "\n"; // collect multiline strings into fromServer
}

System.out.println("Server: " + fromServer);            
if (fromServer.equals("Bye"))
    break;          

System.out.print("Enter your choice: ");
fromClient = stdIn.readLine().trim();

if(fromClient.equals("1"))
{
    System.out.println("Client: " + fromClient);
    output.println(fromClient);
}