简单的聊天程序

				
				import java.io.Serializable;
				import java.text.SimpleDateFormat;
				import java.util.Date;
				
				public class Message implements Serializable{
					protected String msg;
					protected String time;
					protected String sysMsg;
					public Message(String sys,String msg)
					{
						this.sysMsg = sys;
						this.msg = msg;
						this.time = this.getTime();
					}
					//记录时间
					private String getTime()
					{
						SimpleDateFormat df = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss");
						String s = df.format(new Date());
						return s+"\n";
					}
					public String toString()
					{
						return this.time+this.msg+"\n";
					}
					
					
				
				}