public static void main(String[] args) {??boolean flag=true;??while(flag){???Scanner sc=new Scanner(System.in);???System.out.println("請輸入年份");???int year=sc.nextInt();???System.out.println("請輸入月份");???int month=sc.nextInt();???//當前月的天數???int currentDay=0;???//閏年計數???int count=0;???if(year<1900){????System.out.println("您輸入的年份不符合要求，請輸入大于1900的年份");????continue;???}???for(int i=1900;i<year;i++){????if((i%4==0&&i%100!=0)||i%400==0){?????count++;????}???}???int preYear=(year-1900)*365+count;???int totalMonthDay=0;???for(int i=1;i<=month;i++){????int days=0;????switch (i) {????case 2: {?????if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {??????days = 29;?????} else {??????days = 28;?????}?????break;????}????case 4:????case 6:????case 9:????case 11: {?????days = 30;?????break;????}????default:?????days = 31;?????break;????}????if(i==month){//當前月的天數?????currentDay=days;????}????????totalMonthDay+=days;???}???int week=(preYear+totalMonthDay-currentDay+1)%7;???System.out.println("星期天\t星期一\t星期二\t星期三\t星期四\t星期五\t星期六");???int blank=0;???//打印日期前空格???for(int i=1;i<=week;i++){???? blank++;???? System.out.print("\t");???}??//打印日期???for(int i=1;i<=currentDay;i++){????if(blank%7==0){?????System.out.println();????}????blank++;????System.out.print(i+"\t");???}???String l=sc.next();???System.out.println("繼續按Y");???if(l.equalsIgnoreCase("l")){????continue;???}???else{????System.out.println("退出系統");????break;???}??}?}