使用Java创建的播放器

				package javazoom.Util;
				import java.io.*;
				import java.util.*;
				
				/**
				 * This class implements a simple Debug Tool.
				 *
				 * @author	E.B from JavaZOOM
				 * @date	07/10/2001
				 *
				 * Homepage : http://www.javazoom.net
				 *
				 *-----------------------------------------------------------------------
				 *  This program is free software; you can redistribute it and/or modify
				 *  it under the terms of the GNU General Public License as published by
				 *  the Free Software Foundation; either version 2 of the License, or
				 *  (at your option) any later version.
				 *
				 *  This program is distributed in the hope that it will be useful,
				 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
				 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
				 *  GNU General Public License for more details.
				 *
				 *  You should have received a copy of the GNU General Public License
				 *  along with this program; if not, write to the Free Software
				 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
				 *----------------------------------------------------------------------
				 */
				
				public class Debug
				{
				  private static Debug	_instance = null;
				  private PrintWriter 	_out = null;
				  private int			_loglevel = 0;
				
				  private Debug()
				  {}
				
				  /**
				   * Returns Debug instance.
				   */
				  public synchronized static Debug getInstance()
				  {
					  if (_instance == null)
					  {
						_instance = new Debug();
					  }
					  return _instance;
				  }
				
				  /**
				   * Inits log file.
				   */
				  public synchronized void init(String filename, int level)
				  {
				  	_loglevel = level;
				  	try
				  	{
						_out = new PrintWriter(new FileOutputStream(filename));
					} catch (IOException ioe)
					  {
						System.err.println("Cannot open log file : "+ioe.getMessage());
					  }
				  }
				
				  /**
				   * Closes log file.
				   */
				  public synchronized void close()
				  {
					if (_out != null)
					{
					  	try
					  	{
							_out.flush();
							_out.close();
						} catch (Exception ioe)
					      {
							System.err.println("Cannot close log file : "+ioe.getMessage());
					  	  }
				    }
				  }
				
				  /**
				   * Sets log level.
				   */
				  public void setLogLevel(int level)
				  {
					  _loglevel = level;
				  }
				
				  /**
				   * Sends message to log file.
				   */
				  public synchronized void log(int level, String msg)
				  {
					  if (_loglevel >= level)
					  {
						 if (_out != null)
						 {
						  	_out.println(msg);
						  	_out.flush();
					  	 }
					  	 else
					 	 {
							  System.err.println(msg);
					 	 }
					  }
				  }
				}