The first stage of Java Learning-function application-Calendar function

ImportJava.util.Scanner; Public classP06 { Public Static voidMain (string[] args) {//TODO auto-generated Method StubScanner input =NewScanner (system.in); System.out.print ("Please enter a year (greater than 1900):"); intYear=Input.nextint ();  while(year<1900) {System.out.print ("The year you entered has an error, please re-enter:"); year=Input.nextint (); } System.out.print ("Please enter a month:"); intMonth=Input.nextint ();  while(month<1| | Month>12) {System.out.print ("The entered month has an error, please re-enter:"); Month=Input.nextint (); }        //if (isleapyear (year)) {//System.out.println (year+ "Years is a leap year");//        }//else{//System.out.println (year+ "is not a leap year");//        }//        //System.out.println (year+ "year" +month+ "Month has" +getdaysofmonth (year,month) + "Days");//        //System.out.println (year+ "year" +month+ "month 1th" is the "+getdayofthisyear (year, month) +" Day ");//        //System.out.println ("From 1900 to" +year+ "years (excluding the year) is a total of" +getcrossdays "+" days ";//System.out.println ("t \ t two \ t three \ Four \ five \ t six");  for(inti = 0; I <isdayofweek (year, month); i++) {System.out.print ("\ T"); }         for(inti = 1; I <=getdaysofmonth (year, month); i++) {System.out.print (i+ "\ T"); if(I==7-isdayofweek (year, month) | | (I-7+isdayofweek (year, month))%7==0) {System.out.println (); }            }            }    /*** Determine if it is a leap year *@paramYear *@return     */     Public Static BooleanIsleapyear (intYear ) {        returnYear%4==0 && year%100!=0 | | Year%400==0; }    /*** Returns the number of days of the month *@paramYear *@paramMonth *@return     */     Public Static intGetdaysofmonth (intYearintmonth) {        if(month==2) {            if(Isleapyear (year)) {return29; }            Else{                return28; }        }        Else if((month<8 && month%2!=0) | | (month>7&&month%2==0)){            return31; }        Else {            return30; }    }    /*** Returns the first day of the year *@paramYear *@paramMonth *@return     */     Public Static intGetdayofthisyear (intYearintmonth) {        intSum=0;  for(inti = 1; I <=month-1; i++) {sum+=Getdaysofmonth (year, i); }        returnSum+1; }    /*** Calculate the number of days from 1900 to the year (excluding the year)@paramYear *@return     */     Public Static intGetcrossdays (intYear ) {        intSum=0;  for(inti = 1900; I < year;i++) {             for(intj = 1; J <=12; J + +) {sum+=Getdaysofmonth (i, j); }        }        returnsum; }    /*** Calculate the number of days of day 1th of the month (known as 1900-1-1 is Monday) *@paramYear *@paramMonth *@returnback (0~6) corresponds from Sunday to Saturday*/     Public Static intIsdayofweek (intYearintmonth) {        intSum=getcrossdays (year) +Getdayofthisyear (year, month); returnSum%7; }}

The first stage of Java Learning-function application-Calendar function