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++;
}
}

}