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// クライアントプログラム
 
import java.io.*;
import java.util.*;
import java.net.*;
import javax.swing.*;
 
class MessageWindow extends JFrame {
  JTextArea textArea;
  MessageWindow() {
    super("Messages");
    textArea = new JTextArea(25, 80);
    textArea.setEditable(false);
    add(textArea);
    pack();
    setVisible(true);
  }
 
  public void printMessage(String message) {
    textArea.append(message+"\n");
  }
}
 
 
public class ChatCl {
 
  byte[] buf = new byte[ChatParam.MSIZE];
  byte[] send = new byte[ChatParam.MSIZE];
  byte[] cbuf;
  String str;
 
  public static void main(String[] args) {
    try {
      new ChatCl().start(args);
    } catch(Exception e) {
      System.out.println(e);
    }
  }
 
  public void start(String[] args) {
 
    if (args.length < 2) {
      System.out.println("引数: サーバ名 ユーザ名");
      System.exit(1);
    }
 
    try {
      /* サーバへの接続処理 */
      String hostName = args[0];
      Socket sock = new Socket(hostName, ChatParam.PORT);
      BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
      String name = args[1];
      InputStream is = sock.getInputStream();
      OutputStream os = sock.getOutputStream();
 
      System.out.println("[Input]----------------------------------");
 
      MessageWindow mwin = new MessageWindow();
 
      Thread messageReceiveProcess = new Thread(new Runnable(){
        @Override
        public void run() {
          try {
            while(true){
              // メッセージを受信して、bufの中に保存
              int count = is.read(buf);
              if (count > 0) {
                switch (buf[0]) {
                  case ChatParam.LEAVE:
                    str = new String(buf, 1, ChatParam.MSIZE - 1);
                    mwin.printMessage(str.substring(0, str.indexOf(0)));
                    break;
                  case ChatParam.FULL:
                    System.out.println("現在人数制限に達しています");
                    break;
                  case ChatParam.JOIN:
                  case ChatParam.MSG:
                    str = new String(buf, 1, ChatParam.MSIZE - 1);
                    mwin.printMessage(str.substring(0, str.indexOf(0)));
                }
              }
            }
          }catch(Exception e){
            System.out.println(e);
          }
        }
      });
 
      // 最初に参加要求(+ユーザ名)の送信
      send[0] = ChatParam.JOIN;
      cbuf = name.getBytes();
      System.arraycopy(cbuf, 0, send, 1, (cbuf.length < ChatParam.NSIZE)?cbuf.length:ChatParam.NSIZE);
      os.write(send);
 
      // 以下は他の参加者からのメッセージを受信する部分ですが、現状は
      // flagをfalseにして処理をスキップしています。
      messageReceiveProcess.start();
 
      // 以下の部分はメッセージを送信する部分で、他の参加者からのメッセージ
      // を受信する部分とは並列にする必要があります。
      while (true) {
        send[0] = ChatParam.MSG;
        str = name + ":" + input.readLine() + "\0";
        // mwin.printMessage(str);
        cbuf = str.getBytes();
        System.arraycopy(cbuf, 0, send, 1, (cbuf.length < ChatParam.MSIZE - 1)?cbuf.length:(ChatParam.MSIZE - 1));
 
        /* send内のデータを送信 */
        os.write(send);
      }
 
      /* 通信終了処理 */
      // sock.close();
 
    } catch (Exception e) {
      System.out.println("connection error");
      System.exit(1);
    }
  }
}

Main.java:25: error: class ChatCl is public, should be declared in a file named ChatCl.java
public class ChatCl {
       ^
Main.java:27: error: cannot find symbol
  byte[] buf = new byte[ChatParam.MSIZE];
                        ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:28: error: cannot find symbol
  byte[] send = new byte[ChatParam.MSIZE];
                         ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:50: error: cannot find symbol
      Socket sock = new Socket(hostName, ChatParam.PORT);
                                         ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:69: error: cannot find symbol
                  case ChatParam.LEAVE:
                       ^
  symbol: variable ChatParam
Main.java:70: error: cannot find symbol
                    str = new String(buf, 1, ChatParam.MSIZE - 1);
                                             ^
  symbol: variable ChatParam
Main.java:73: error: cannot find symbol
                  case ChatParam.FULL:
                       ^
  symbol: variable ChatParam
Main.java:76: error: cannot find symbol
                  case ChatParam.JOIN:
                       ^
  symbol: variable ChatParam
Main.java:77: error: cannot find symbol
                  case ChatParam.MSG:
                       ^
  symbol: variable ChatParam
Main.java:78: error: cannot find symbol
                    str = new String(buf, 1, ChatParam.MSIZE - 1);
                                             ^
  symbol: variable ChatParam
Main.java:90: error: cannot find symbol
      send[0] = ChatParam.JOIN;
                ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:92: error: cannot find symbol
      System.arraycopy(cbuf, 0, send, 1, (cbuf.length < ChatParam.NSIZE)?cbuf.length:ChatParam.NSIZE);
                                                        ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:92: error: cannot find symbol
      System.arraycopy(cbuf, 0, send, 1, (cbuf.length < ChatParam.NSIZE)?cbuf.length:ChatParam.NSIZE);
                                                                                     ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:102: error: cannot find symbol
        send[0] = ChatParam.MSG;
                  ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:106: error: cannot find symbol
        System.arraycopy(cbuf, 0, send, 1, (cbuf.length < ChatParam.MSIZE - 1)?cbuf.length:(ChatParam.MSIZE - 1));
                                                          ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:106: error: cannot find symbol
        System.arraycopy(cbuf, 0, send, 1, (cbuf.length < ChatParam.MSIZE - 1)?cbuf.length:(ChatParam.MSIZE - 1));
                                                                                            ^
  symbol:   variable ChatParam
  location: class ChatCl
16 errors

Standard output is empty