java 日期加天数得到新的日期

package com.zhang.test;

import java.text.SimpleDateFormat;
import java.util.Date;

import com.sun.org.apache.xerces.internal.impl.xpath.regex.ParseException;

public class Test {

 public static Date addDate(Date d,long day) throws ParseException {

  long time = d.getTime();
  day = day*24*60*60*1000;
  time+=day;
  return new Date(time);

  }

 /**
  * @param args
  */
 public static void main(String[] args) {
  /*
  java.util.Date dt=new java.util.Date();
  System.out.println(dt);   //输出结果是：Wed Aug 10 11:29:11 CST 2005

  SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
  System.out.print(sdf.format(dt) + 12);
  */
  Date d = new Date();
  
  Date newDate = addDate(d, 12);
  

  SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
  System.out.println(dateFormat.format(d));
  System.out.println(dateFormat.format(newDate));

 }

}