Java implementation prints the calendar for the current month

The current calendar is printed, and the current date is expressed in *.

The key is that the first day of the month is the week.

Kimlarsson Calculation formula
W= (d+2*m+3* (m+1)/5+y+y/4-y/100+y/400) MoD 7

In the formula, D represents the number of days in a date +1,m represents the number of months. Y represents the number of years.

Note 1: There is a different formula in the formula:
Think of January and February as the January or March and January or April of the previous year,
Example: Assume that the 2004-1-10 is converted to: 2003-13-10 to substitute the formula calculation.

Note 2: In the calendar of most Catholic countries, in 1752 years there is no 9.3-9.13. In the calendar of the year September 2
The following is a direct September 14, so in the calculation of the day is the days of the algorithm to take this particular situation into account

Package Work_0529;import Java.util.scanner;public class Main {private static int year;private static int month;private STA               Tic int day;private static boolean flag;private static int count;//days of the current month public static void main (string[] args) {         if (!getinput ()) return;        if (!judgedata ()) return;                 int a = GetData ();        System.out.println ("Day 123456");        int j=0; while (a--> 0) {System.out.print ("");        j + +;}        for (int i=1;i <= count; i++) {if (j%7==0) System.out.println ("\ n");        j + +;        System.out.print (String.Format ("%4d", I));        if (day==i) System.out.print ("*"); }}private static Boolean Judgedata () {flag=false;//false represents common year.    Conversely if (year%100==0) flag=true;    else if (year%4==0) flag=true;    if (year<=0) {System.out.println ("year cannot be less than or equal to 0");    return false;    } if (Month<=0 | | month>12) {SYSTEM.OUT.PRINTLN ("Check the range of months"); return false;} if (month==2) {if (fLag && day>29) {System.out.println ("current is" + (flag?)    Leap year ":" Common Year ") +" February cannot be greater than 29 ");    return false; if (!flag && day >) {System.out.println ("current is" + (flag?
 
 
"Leap Year": "Common Year") + "February cannot be greater than 28");    return false;    } if (flag) count=29;    else count=28; } if (Month==1 | | month==3 | | month==5| | month==7| | month==8| | month==10| | month==12) {if (day<=0 | | Day > 3    1) {System.out.println ("Scope of the inspection date");    return false;    } count = 31;    } else if (month!=2) {if (day<=0 | | day>30) {System.out.println ("Scope of the check Date");    return false;    } count = 30; }return true;}    private static int getData () {int tmpday=1;//denotes int A;    if (month = = 1 | | month = = 2) {month + =; year--;} if ((year<1752) | | |     (year==1752 && month<9) | | (year==1752 && month==9 && tmpday<3))    {a = (Tmpday + 2*month + month+1)/5 + year + YEAR/4 +5)% 7;    }else{A = (Tmpday + 2*month + (month+1)/5 + year + YEAR/4-year/100 + year/400)%7; }return A;} private static Boolean getinput () {try {System.out.print ("Please enter date (format xxxx-xx-xx):"); Scanner Scanner = new Scanner (system.in); String str = scanner.nextline ();Year = Integer.parseint (str.substring (0, Str.indexof ('-'))); str = str.substring (Str.indexof ('-') + 1, str.length ()); month = Integer.parseint (str.substring (0, Str.indexof ('-'))), str = str.substring (Str.indexof ('-') + 1, str.length ()); Day = Integer.parseint (str); return true;} catch (NumberFormatException e) {System.out.println ("Malformed"),} catch (Stringindexoutofboundsexception E2) { System.out.println ("Malformed");} return false;}}

Java implementation prints the calendar for the current month