Suppose That Sock Refers to a TCP Socket Connected to Another

question 4

Multiple Choice

Suppose that sock refers to a TCP socket connected to another machine, and in is aScanner. Which code sends the string "Who is there?" to the other machine, receives the return answer, and then prints it?

• A) PrintWriter pw = new PrintWriter(sock.getOutputStream().println("Who is there?"));
• InputStream instream = sock.getInputStream();
• Scanner in = new Scanner(instream);
• System.out.println(in.nextLine());
• B) PrintWriter pw = new PrintWriter(sock.getInputStream());
• pw.println("Who is there?");
• pw.flush();
• InputStream instream = sock.getInputStream();
• Scanner in = new Scanner(instream);
• System.out.println(in.nextLine());
• C) PrintWriter pw = new PrintWriter(sock.getOutputStream());
• pw.flush("Who is there");
• InputStream instream = sock.getInputStream();
• Scanner in = new Scanner(instream);
• System.out.println(in.nextLine());
• D) PrintWriter pw = new PrintWriter(sock.getOutputStream());
• pw.println("Who is there?");
• pw.flush();
• InputStream instream = sock.getInputStream();
• Scanner in = new Scanner(instream);
• System.out.println(in.nextLine());

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Definitions:

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