java 利用Calendar進行日期更改

//建立1個日期實例

Date tomorrow= new Date();

//獲取今天日期

Date nowDate = Calendar.getInstance().getTime();

// 構建Calendar實例
Calendar calendars = Calendar.getInstance();

calendars.setTime(nowDate);

//日歷加一

calendars.add(Calendar.DAY_OF_MONTH,+1);

tomorrow= new Date(calendars.getTimeInMillis());

//轉換類型日歷轉字符串

String dateStr = new SimpleDateFormat("yyyyMMdd").format(tomorrow);