java实现msn的功能

				/*
				 * @(#)EventViewer.java
				 *
				 * Copyright (c) 2002, Jang-Ho Hwang
				 * All rights reserved.
				 *
				 * Redistribution and use in source and binary forms, with or without
				 * modification, are permitted provided that the following conditions
				 * are met:
				 *
				 * 	1. Redistributions of source code must retain the above copyright
				 * notice, this list of conditions and the following disclaimer.
				 *
				 * 	2. Redistributions in binary form must reproduce the above copyright
				 * notice, this list of conditions and the following disclaimer in the
				 * documentation and/or other materials provided with the distribution.
				 *
				 * 	3. Neither the name of the Jang-Ho Hwang nor the names of its contributors
				 * may be used to endorse or promote products derived from this software
				 * without specific prior written permission.
				 *
				 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
				 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
				 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
				 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR
				 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
				 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
				 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
				 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
				 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
				 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
				 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
				 *
				 *    $Id: EventViewer.java,v 1.4 2002/08/15 15:33:20 xrath Exp $
				 */
				package rath.jmsn;
				
				import java.awt.*;
				import javax.swing.*;
				
				import java.util.Date;
				import java.text.SimpleDateFormat;
				
				import rath.msnm.entity.MsnFriend;
				/**
				 *
				 * @author Jang-Ho Hwang, rath@linuxkorea.co.kr
				 * @version $Id: EventViewer.java,v 1.4 2002/08/15 15:33:20 xrath Exp $
				 */
				public class EventViewer extends JComboBox implements ToolBox
				{
					private SimpleDateFormat sdf = new SimpleDateFormat("[HH:mm]");
					private int limitSize = 30;
				
					public EventViewer()
					{
						setFont( FONT );
					}
				
					/**
					 * 捞 Event viewer啊 茄锅俊 焊咯临 荐 乐绰 弥措 农扁甫 搬沥茄促.
					 */
					public void setLimitSize( int size )
					{
						this.limitSize = size;
					}
				
					public int getLimitSize()
					{
						return this.limitSize;
					}
				
					private boolean fireEvent = true;
				
					public void addEvent( String msg, MsnFriend friend )
					{
						String view = sdf.format(new Date()) + " " + msg;
						insertItemAt( new Event(view, friend), 0 );
						ensureLimitOverflow();
				
						fireEvent = false;
						setSelectedIndex( 0 );
						fireEvent = true;
					}
				
					protected void ensureLimitOverflow()
					{
						if( getItemCount()>limitSize )
						{
							for(int i=getItemCount()-1; i>=limitSize; i--)
								removeItemAt(i);
						}
					}
				
					/**
					 * Override. Only accept to EventDispatchThread call.
					 */
					protected void fireActionEvent()
					{
						if( fireEvent )
							super.fireActionEvent();
					}
				
					public static class Event
					{
						private String msg;
						private MsnFriend friend;
				
						private Event( String msg, MsnFriend friend )
						{
							this.msg = msg;
							this.friend = friend;
						}
				
						public MsnFriend getFriend()
						{
							return this.friend;
						}
				
						public String toString()
						{
							return this.msg;
						}
					};
				
					public void clear()
					{
				
					}
				}