public static void main(String[] args) throws Exception {int year;int month;int day = 0;int sumA = 0;int sumB = 0;System.out.println("* * * * * * * * * * * * * * * * * *欢迎使用万年历* * * * * * * * * * * * * * * * * */n ");Scanner input = new Scanner(System.in);System.out.print("请输入年份:/n");year = input.nextInt();System.out.print("请输入月份:/n");month = input.nextInt();boolean count;count = (year % 4 == 0 && year % 100 != 0 || year % 400 == 0);for (int i = 1900; i < year; i++) {if (i % 4 == 0 && i % 100 != 0 || i % 400 == 0) {sumA = sumA + 366;} else {sumA = sumA + 365;}}for (int k = 1; k < month; k++) {if (k == 1 || k == 3 || k == 5 || k == 7 || k == 8 || k == 10|| k == 12) {sumB = sumB + 31;} else if (k == 2 && count) {sumB = sumB + 29;} else if (k == 2 && !count) {sumB = sumB + 28;} else if (k == 4 || k == 6 || k == 9 || k == 11) {sumB = sumB + 30;}}for (int k = 1; k < month; k++) {if (month == 1 || month == 3 || month == 5 || month == 7|| month == 8 || month == 10 || month == 12) {day = 31;} else if (month == 2 && count) {day = 29;} else if (month == 2 && !count) {day = 28;} else if (month == 4 || month == 6 || month == 9 || month == 11) {day = 30;}}int sum = sumA + sumB;//System.out.println(sum);int weekDay = 1 + sum % 7;System.out.println("/t/t/t" + year + "年" + month + "月");System.out.println("星期日/t星期一/t星期二/t星期三/t星期四/t星期五/t星期六/t");if (weekDay == 7) {weekDay = 0;}for (int nullNo = 0; nullNo < weekDay; nullNo++) {System.out.print(" /t");}for (int i = 1; i <= day; i++) {if ((sum + i) % 7 == 6) {System.out.print(i);System.out.println();} else {System.out.print(i + "/t");}}System.out.println("/n");long begin = System.currentTimeMillis(); SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Date currentTime = new Date();//得到当前系统时间 String timeStr_1 = formatter.format(currentTime); //将日期时间格式化 long end = System.currentTimeMillis(); System.out.println(timeStr_1 + " cost:" + (end - begin) + "ms"); }