获取两个日期之间的日期

public List<String> getBetweenDateStr(Date start, Date end){
        if(start==null || end==null)return null;
        List<String> list=new ArrayList<String>();
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
        String endstr = sdf.format(end);
        boolean go=true;
        Calendar ca=Calendar.getInstance();
        ca.setTime(start);
        while(go){
            ca.add(Calendar.DAY_OF_MONTH, 1);
            String startstr = sdf.format(ca.getTime());
            list.add(startstr);
            if(startstr.equals(endstr)){
               go=false;15             }
        }
        return list;
    }