【0】README 1）本文主要解決“錯誤，找不到符號”
【1】 console error info 1）error :? E:\bench-cluster\mybatis_in_action_eclipse\xmpp\src>javac com/communication/qq/ServerPlainTest.java com\communication\qq\ServerPlainTest.java:14: 錯誤: 找不到符號new Thread(new ReceiveHandler(s, Role.SERVER)).start();^符號: 類 ReceiveHandler位置: 類 ServerPlainTest com\communication\qq\ServerPlainTest.java:15: 錯誤: 找不到符號new Thread(new SendHandler(s, Role.SERVER)).start();^符號: 類 SendHandler位置: 類 ServerPlainTest 2 個錯誤 2）reasons of errors: ?參考一下代碼，ServerPlainTest 依賴于 ReceiverHandler.java ?and SendHandler.java ；而 ReceiverHandler.java and SendHandler.java 定義在 MessageHandler.java ，它們屬于包內可見性，包外不可見； 由編譯報錯的結果來看，當javac 編譯器去編譯ServerPlainTest.java的時候，它 不會去編譯 包可見性的類，所以就不會產生 相應的 .class 文件，所以報錯；
public class ServerPlainTest { // 包內包外可見public static void main(String[] args) {try {ServerSocket ss = new ServerSocket(8189);System.out.println("the server has startuped, waiting for connections.");while (true) { // accept multiple clients connection request.Socket s = ss.accept();System.out.println("a client has connected successfully.");new Thread(new ReceiveHandler(s, Role.SERVER)).start();new Thread(new SendHandler(s, Role.SERVER)).start();}} catch (Exception e) {System.out.println(e);}} }public class MessageHandler { // 包內包外可見. }// receive msg. class ReceiveHandler implements Runnable { // 包內可見性.private Socket socket;private Role role;public ReceiveHandler(Socket socket, Role role) {this.socket = socket;this.role = role; }public void run() {try {System.out.println(role + " executes ReceiveHandler.run method.");InputStream is = socket.getInputStream();Scanner in = new Scanner(is);// echo client inputboolean done = false;while (!done && in.hasNextLine()) {String line = in.nextLine();System.out.println("from "+ role + ": " + line);if (line.trim().equalsIgnoreCase("bye")) {done = true;}}// close relative instance.in.close();} catch (IOException e) {e.printStackTrace();} } }// send msg. class SendHandler implements Runnable { // 包內可見性.private Socket socket;private Role role;public SendHandler(Socket socket, Role role) {this.socket = socket;this.role = role; }public void run() {PrintWriter pw = null;try {System.out.println(role + " executes SendHandler.run method.");Scanner s = new Scanner(System.in);OutputStream os = socket.getOutputStream();pw = new PrintWriter(os, true); // autoFlush=true.if (role.equals(Role.SERVER)) {pw.println("from server: you've connected with the server.");}while (s.hasNext()) {String line = s.nextLine();pw.println(line);}pw.println("connection closed successfully. bye!");} catch (Exception e) {e.printStackTrace();} } }【2】solution：在編譯 ServerPlainTest.java 之前，編譯 MessageHandler.java， 這樣會附帶編譯 ReceiverHandler.java and SendHandler.java ；
E:\bench-cluster\mybatis_in_action_eclipse\xmpp\src>javac com/communication/qq/ServerPlainTest.java com/communication/qq/MessageHandler.java

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