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++;
        }
    }

}