一个java程序片段

public static Date getNewDateByAdd(Date d, int days) {
int Year, Month, Day;
int DayOfMonths[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
Calendar cal;
cal = Calendar.getInstance();
cal.setTime(d);

Year = cal.get(cal.YEAR);
Month = cal.get(cal.MONTH);
Day = cal.get(cal.DAY_OF_MONTH);
Day += days; //日增加

DayOfMonths[1]=isLeapYear(Year)?29:28; //闰年二月设置为29天

while (Day > DayOfMonths[Month]) {
Day = Day - DayOfMonths[Month];
Month++;
if (Month > 11) {
Month = 0;
Year++;
}
}

cal.set(Year, Month, Day);
return cal.getTime();
}

public static boolean isLeapYear(int year){
if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
return true;
return false;
}