Calendar如何求得本周的星期一的日期

Question

Calendar.getInstance().getFirstDayofWeek()

Answer 1

补充:
/* 求某月天数 */
int year = 2003;
int month = 2;//设置此月1号
Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("CTT"));
calendar.set(Calendar.YEAR,year);
calendar.set(Calendar.MONTH,month-1);
calendar.set(Calendar.DAY_OF_MONTH,1);//设置此月的下个月1号
Calendar calendar2 = Calendar.getInstance(TimeZone.getTimeZone("CTT"));
calendar2.set(Calendar.YEAR,year);
calendar2.set(Calendar.MONTH,month-1+1);
calendar2.set(Calendar.DAY_OF_MONTH,1);
int result = (int)((calendar2.getTime().getTime()-calendar.getTime).getTime())/(24*60*60*1000));
System.out.println(year+"年"+month+"月 天数："+result);/* 求某天礼拜几 */int year3=2003;
int month3=4;
int day3=8;
Calendar calendar3 = Calendar.getInstance(TimeZone.getTimeZone("CTT"));
calendar3.set(Calendar.YEAR,year3);
calendar3.set(Calendar.MONTH,month3-1);
calendar3.set(Calendar.DAY_OF_MONTH,day3);
System.out.println(year3+"年"+month3+"月"+day3+"日 是礼拜"+(calendar3.getCalendar.DAY_OF_WEEK)-1));