publicstaticvoidmain(String[] args){Calendar calendar=Calendar.getInstance();//操作日历的方法for(int year =1999; year <10000; year+=100){//+=100,年是一百年一个世纪calendar.set(Calendar.YEAR,year); calendar.set(Calendar.MONTH,11);//11是12月的意思calendar.set(Calendar.DAY_OF_MONTH,31);System.out.println(year+" "+calendar.get(Calendar.DAY_OF_WEEK));if(calendar.get(Calendar.DAY_OF_WEEK)==1){break;}}}19996209952199322991//2299的12月31日是星期天