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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 {
  public static void main(String[] args) {
    byte[] buf = new byte[ChatParam.MSIZE];
    byte[] send = new byte[ChatParam.MSIZE];
    byte[] cbuf;
    String str;
 
    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 */
 
      BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
      String name = args[1];
 
      System.out.println("[Input]----------------------------------");
 
      MessageWindow mwin = new MessageWindow();
 
      // 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);
 
 
      boolean flag = false;
      // 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。
      while (flag) {
 
	// メッセージを受信して、bufの中に保存
 
	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");
	  flag = false;
	  break;
	case ChatParam.JOIN:
	case ChatParam.MSG:
	  str = new String(buf, 1, ChatParam.MSIZE - 1);
	  mwin.printMessage(str.substring(0, str.indexOf(0)));
	}
      }
 
      // 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 */
      }
 
      /* 通信終了処理 */
 
    } 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:48: error: cannot find symbol
      send[0] = ChatParam.JOIN;
                ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:50: 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:50: 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:61: error: cannot find symbol
	case ChatParam.LEAVE:
	     ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:62: error: cannot find symbol
	  str = new String(buf, 1, ChatParam.MSIZE - 1);
	                           ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:65: error: cannot find symbol
	case ChatParam.FULL:
	     ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:69: error: cannot find symbol
	case ChatParam.JOIN:
	     ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:70: error: cannot find symbol
	case ChatParam.MSG:
	     ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:71: error: cannot find symbol
	  str = new String(buf, 1, ChatParam.MSIZE - 1);
	                           ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:79: error: cannot find symbol
	send[0] = ChatParam.MSG;
	          ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:83: 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:83: 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
15 errors

Standard output is empty