java 得到以后的日期

import java.text.parseexception;

import java.text.simpledateformat;

import java.util.calendar;

import java.util.date;

public class datecomparedemo {

     //得到以后的日期

     public date datecompare(string str, int month,int day) throws parseexception {

          date date = null;

          simpledateformat df = new simpledateformat("yyyy-mm-dd" );

          date = df.parse(str);

          calendar c = calendar. getinstance();

          c.settime(date);

          c.add(calendar. month, month);

          c.add(calendar. day_of_month, day);

          return c.gettime();

     }

     public static void main(string[] args) throws parseexception {

          datecomparedemo dcd = new datecomparedemo();

          string a = "2010-01-01";

          date b = dcd.datecompare( "2010-05-03", 0, 0);

          date a1 = dcd.datecompare(a, 3, 0);  //得到a三个月以后的日期

          date a2 = dcd.datecompare(a, 0, 5);   //得到a五天后的日期

          int result1 = a1.compareto(b);

          int result2 = a2.compareto(b);

          if(result1 < 0) {

               system. out.println("a三个月以后的日期比b小" );

          } else {

               system. out.println("a三个月以后的日期比b大" );

          }

          if(result2 <0) {

               system. out.println("a五天后的日期比b小" );

               system. out.println("a五天后的日期比b大" );

}

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http://blog.yemou.net/article/query/info/tytfjhfascvhzxcyt222