求教用java编写一个程序要求给定一个日期值，计算若干天后的日期值，和给定两个日期计算它们之间相距的天

Posted 2023-04-01

谢谢

参考技术A public static int getIntervalDays(String date1, String date2)
return getIntervalDays(getTime(date1), getTime(date2));


public static int getIntervalDays(long s1, long s2)
return (int) ( (s1 - s2) / (24 * 3600 * 1000L));


public static java.sql.Date str2date(String sDate)
if (sDate == null || sDate.equals(""))
return null;
if (sDate.charAt(0) > '9' || sDate.charAt(0) < '0')
return null;
sDate = sDate.replace('/', '-');
String[] ar = strSplit(sDate, "- :");
if (ar.length < 3)
return null;
return java.sql.Date.valueOf(ar[0] + "-" + ar[1] + "-" + ar[2]);


public static long getTime(Object date)
if (isEmpty(date))
return System.currentTimeMillis();
return str2date(date.toString()).getTime();


public static String getDateFromDate(String date, int avail)
long lg = getTime(date);
return getDateString(lg + (long) avail * 86400000L);


public static String getDateString(long mill)
java.sql.Date date = new java.sql.Date(mill);
return date.toString();
本回答被提问者采纳 参考技术B java.util.Date 好像有对应的API干这俩事吧