java 日期增加

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

 public class Test {

     public static void main(String[] args) throws ParseException {
         //以下从1号开始增加10天
         SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
         int i =0;
         Date nextday=null;
         String a=null;
         while (i<10) {
             if (i==0) {
                  a = sdf.format(sdf.parse("2016-01-01").getTime()+0*24*60*60*1000);
             }else{
                 a = sdf.format(nextday.getTime()+1*24*60*60*1000);
             }

             nextday = sdf.parse(a);
             System.out.println(sdf.format(nextday));
             i++;
         }
     }

 }