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final static String dayNames[] = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
final static SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");
....
String strStart ="2010-01-11";
Date date = sf.parse(strStart);
Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.add(Calendar.DAY_OF_YEAR, 100);
String day = dayNames[cal.get(Calendar.DAY_OF_WEEK) - 1];
System.out.println(day);