Hello, please tell me the sockets. There is a code:

import java.io.*; import java.net.*; public class DailyAdviceServer { String[] adviceList = {"Ешьте меньшими порциями", "Купите облегающие джинсы. Нет, они сделают вас " + "полнее.", "Два слова: не годится", "Будьте честны хотя бы сегодня. Скажите своему " + "начальнику все, что вы *на самом деле* о нем думаете.", "Возможно, вам " + "стоит подобрать другую прическу."}; public void go() { try { ServerSocket serverSock = new ServerSocket(4242); while(true) { Socket sock = serverSock.accept(); PrintWriter writer = new PrintWriter(sock.getOutputStream()); String advice = getAdvice(); writer.println(advice); writer.close(); System.out.println(advice); } } catch(IOException e) { e.printStackTrace(); } } private String getAdvice() { int random = (int)(Math.random() * adviceList.length); return adviceList[random]; } public static void main(String[] args) { DailyAdviceServer server = new DailyAdviceServer(); server.go(); } }

Interested in this fragment:

  try { ServerSocket serverSock = new ServerSocket(4242); while(true) { Socket sock = serverSock.accept(); PrintWriter writer = new PrintWriter(sock.getOutputStream()); String advice = getAdvice(); writer.println(advice); writer.close(); System.out.println(advice); } } catch(IOException e) { e.printStackTrace(); }

Here a server socket is created, a port is assigned. But I can’t understand how the accept() method works. As I understand it, it is waiting for the connection from the client. Those. if the client has not initiated the connection, these lines are not executed?

  PrintWriter writer = new PrintWriter(sock.getOutputStream()); String advice = getAdvice(); writer.println(advice); writer.close(); System.out.println(advice);

    1 answer 1

    In javadoc to the java.net.ServerSocket.accept() method, it is specified

    Listens and accepts it. The method blocks until a connection is made.

    This means that the operation is blocking. While the connection is coming to the socket, the stream on the server will wait in this connection method.