JAVA -- output calendar of specified month and year

1. purpose

Output a calendar of one month of the current time in the current time zone (1 to 28 / 29 / 30 / 31, and the day of the week for each day)

2. grammar

GregorianCalendar(): constructs a new object using machine time.
Gregorian calendar (int year, int month, int dayofmonth, int houseofday, int minute, int second): constructs a new object with the specified year, month, day, hour, minute, and second.
Gregorian calendar (locale a locale): constructs a new object with the locale, default time zone, and local time specified by a locale.
Gregorian calendar (TimeZone zone): constructs a new object with the time zone specified by zone, the default zone, and the current time.
Gregorian calendar (timezone zone, local alocal): constructs a new object with the time zone specified by zone, the region specified by alocal, and the current time.

3. code

import java.util.Calendar;
import java.util.GregorianCalendar;
//import java.util.Scanner;

public class rw9 {
    static final String week[]= {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int i;
        int year=2018;//Set the specified year
        int month=9;//Set the specified month
        System.out.println(year + "year"+ month + "The calendar of the month is as follows:\n");
        System.out.println("=========================================");
        GregorianCalendar cal=new GregorianCalendar(year,month-1,1);//Create objects for year, month, and first day
        int totalDays =cal.getActualMaximum(Calendar.DAY_OF_MONTH);//Get the days of the month
        int startDay =cal.get(Calendar.DAY_OF_WEEK)-1;//What day of the week is the first day of the month
        for(i=0;i<week.length;i++)
            System.out.print(week[i]+"     ");//Output 7 days of week
        System.out.println();
        for(i=0;i<startDay;i++)
            System.out.print("            ");//Output spaces before the first day
        for(int day =1;day<=totalDays;day++) {
            if(day<=8) {               //For output control
                System.out.print(day + "           ");//Output each day in turn
            }else {
                System.out.print(day+"          ");
            }
            i++;
            if(i==7) {  //Line break after losing every week
                System.out.println();
                i=0;
            }
        }
    }

}

4. results

The compilation results are as follows:

The operation results are as follows: