学步园

    static java.util.Date addDays(java.util.Date date,int amount)   
              //Adds a number of days to a date returning a new object.  
              //一个日期对象＋n天  
    static java.util.Date addHours(java.util.Date date,int amount)  
    　　      //Adds a number of hours to a date returning a new object.  
              //一个日期对象＋n小时  
    static java.util.Date addMilliseconds(java.util.Date date,int amount)   
              //Adds a number of milliseconds to a date returning a new object.  
              //一个日期对象+n毫秒  
    static java.util.Date addMinutes(java.util.Date date,int amount)   
              //Adds a number of minutes to a date returning a new object.  
              //一个日期对象+n分  
    static java.util.Date addMonths(java.util.Date date,int amount)   
              //Adds a number of months to a date returning a new object.  
              //一个日期对象＋n月  
    static java.util.Date addSeconds(java.util.Date date,int amount)  
    　　      //Adds a number of seconds to a date returning a new object.  
    　　      //一个日期对象＋n秒  
    static java.util.Date addWeeks(java.util.Date date,int amount)   
              //Adds a number of weeks to a date returning a new object.  
              //一个日期对象＋N个星期  
    static java.util.Date addYears(java.util.Date date,int amount)   
              //Adds a number of years to a date returning a new object.  
              //一个日期对象＋N年  
    static boolean isSameDay(java.util.Date date1,java.util.Date date2)   
              //Checks if two date objects are on the same day ignoring time.  
              //两个日期对象是否相等（只比较年－月－日）  
    static boolean isSameInstant(java.util.Date date1,java.util.Date date2)   
              //Checks if two date objects represent the same instant in time.  
              //比较两个日期是否完全相等（精确到毫秒）  
    static java.util.Date parseDate(java.lang.String str,java.lang.String[] parsePatterns)  
              //Parses a string representing a date by trying a variety of different parsers.  
             //例 ：  
               String[] format={"yyyy-MM-dd"};  
               System.out.println(DateUtils.parseDate("2009-10-20",format));