java内两个时间比较

import java.text.*;  
import java.util.*;  
  
public class TimeCompare{  
  
 public static void main(String[] args){  
  boolean flag = isDateBefore("2004-09-09 12:12:12","2005-09-09 16:00:00");  
  System.out.println(flag);  
  flag = isDateBefore("2006-09-09 01:01:01","2005-09-09 16:00:00");  
  System.out.println(flag);  
  flag = isDateBefore("2005-09-09 01:01:01");  
  System.out.println(flag);  
 }  
  
 //判断时间date1是否在时间date2之前  
 //时间格式 2005-4-21 16:16:34  
 public static boolean isDateBefore(String date1,String date2){  
  try{  
   DateFormat df = DateFormat.getDateTimeInstance();  
   return df.parse(date1).before(df.parse(date2));   
  }catch(ParseException e){  
   System.out.print("[SYS] " + e.getMessage());  
   return false;  
  }  
 }  
   
 //判断当前时间是否在时间date2之前  
 //时间格式 2005-4-21 16:16:34  
 public static boolean isDateBefore(String date2){  
  try{  
   Date date1 = new Date();  
   DateFormat df = DateFormat.getDateTimeInstance();  
   return date1.before(df.parse(date2));   
  }catch(ParseException e){  
   System.out.print("[SYS] " + e.getMessage());  
   return false;  
  }  
 }  
  
}