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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:71: error: cannot find symbol
					case ChatParam.MSG:
					     ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:72: error: cannot find symbol
						str = new String(buf, 1, ChatParam.MSIZE - 1);
						                         ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:80: error: cannot find symbol
				send[0] = ChatParam.MSG;
				          ^
  symbol:   variable ChatParam
  location: class ChatCl
Main.java:84: 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:84: 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