高手请进,java问题

Question

用Calendar类，它里面有方法，具体不说了啊

Answer 1

public static void xxx() throws Exception{
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
String str_today="2007-12-06";
Date date=df.parse(str_today);

Calendar cal  = Calendar.getInstance();
cal.setFirstDayOfWeek(Calendar.MONDAY);//注意这里
cal.setTime(date);

cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
System.out.println(df.format(cal.getTime()));//周一
cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
System.out.println(df.format(cal.getTime()));//周日
}