日历

public class runnian {
    public static void main(String[] arge, int sun) {
        System.out.println("请输入年份");
        Scanner in = new Scanner(System.in);
        int year = in.nextInt();
        if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
            System.out.println("闰年");
        } else {
            System.out.println("平年");
        }
        System.out.println("请输入月份");
        int month = in.nextInt();
        switch (month) {
            case 2: {
                if ((year % 4) == 0) {
                    System.out.println(month + "月是28天");
                } else
                    System.out.println(month + "月是29天");
            }
            break;
            case 1:
                break;
            case 3:
                break;
            case 5:
                break;
            case 7:
                break;
            case 8:
                break;
            case 10:
                break;
            case 12:
                System.out.println(month + "月是31天");
                break;
            default:
                System.out.println(month + "月是30天");
                break;

        }
        int sum = 0;
        int weekday = sum % 7;
        for (int i = 1900; i < year; i++) {
            if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
                sum += 366;
            } else {
                sum += 365;
            }
        }
        for(int i=1;i<month;i++){
            if(i==2){
                if(year%4==0&&year%100!=0||year%400==0){
                    sum+=29;
                }
                else {
                    sum+=28;
                }
            }
                else {
                if(year%4==0&&year%100!=0||year%400==0){
                    sum+=30;
                }
                else {
                    sum += 30;
                }
            }

        }
        int days=0;
        if(month==2){
            if(year%4==0&&year%100!=0||year%400==0){
                days=29;
            }
            else {
                days=28;
            }
        }else if(month==4||month==6||month==9||month==11){
            days=30;
        }
        else {
            days=31;
        }
        int weekdays=sum%7;
        System.out.println("日	一	二	三	四	五	六");
        for(int i=1;i<=weekdays;i++){
            System.out.print("	");
        }
         for(int i=1;i<=weekday;i++){
            if(sum%7==6){
                System.out.print(i+"
");
            }
            else {
                System.out.print(i+"
");
            }
            sum+=1;
         }
    }
}