package practice;
import java.util.Calendar;
import java.util.Scanner;
import java.util.TimeZone;
/**
 * Created by fangjiejie on 2016/11/27.
 */
public class Mydate {
    public static final int dayNum[]={
   31,28,31,30,31,30,31,31,30,31,30,31};
    static boolean judgeYear(int year){
   // Judging whether it is a leap year, it is 29 days in the leap year
        if((year%400==0)||((year%4==0)&&(year%100!=0))){
   return true;}
        else{
   return false;}
    }
    static void show(int year,int month,Calendar calendar){
        if(judgeYear(year)){
            dayNum[1]=29;
        }
        int count=dayNum[month];// Record the total number of days of the current month
        calendar.set(Calendar.YEAR,year);
        calendar.set(Calendar.MONTH,month);
        calendar.set(Calendar.DAY_OF_MONTH,1);
        System.out.println(calendar.getTime());
        int p=calendar.get(Calendar.DAY_OF_WEEK);// Calculate the first day of the current month is the first day of the week
                                                   // This result is calculated on the first day on Sunday,
        for(int i=0;i<p-1;i++)// The empty number of days can be added with spaces
        {
            System.out.print("       ");
        }
        int c=1;// c means one day of the current month, starting from No. 1
        while(c<=count){
            p++;// Use P to control the change of the bank
            System.out.print(c+"     ");
            if(c<10){
                System.out.print(" ");// For the alignment of the format, the number of days of one digit outputs the space
            }
            if(p%7==1){
                System.out.println();
            }
            c++;
        }
    }
    public static void main(String[] args) {
        Calendar Md=Calendar.getInstance();
        Md.setTimeZone(TimeZone.getTimeZone("GMT+8"));
        int year=Md.get(Calendar.YEAR);
        int month=Md.get(Calendar.MONTH);
        show(year,month,Md);
        while(true) {
            System.out.println();
            System.out.println("If you want to continue to find the calendar of a certain year and a month, then");
            Scanner reader = new Scanner(System.in);
            System.out.println("Please enter the year:");
            year = reader.nextInt();
            System.out.println("Please enter the month:");
            month = reader.nextInt();
            show(year, month - 1, Md);
        }

    }
}

/***** Formatting Date of Class ****** /
public class FF {
    public static void main(String[] args) {
        System.out.println(new Date());
        SimpleDateFormat l= new SimpleDateFormat("yyyy-MM-dd HH:mm;ss"); // Set the format template
        System.out.println(l.format(new Date()));
        Calendar c=Calendar.getInstance(); // No need to instantiate the static method creation
        c.setTimeZone(TimeZone.getTimeZone("GMT+8"));
        System.out.println(c.get(Calendar.YEAR));
        System.out.println((c.get(Calendar.MONTH))+1);
        System.out.println(c.get(Calendar.DAY_OF_MONTH));
        System.out.println(c.get(Calendar.HOUR_OF_DAY));
        System.out.println(c.get(Calendar.MINUTE));
        System.out.println(c.get(Calendar.SECOND));
        c.set(Calendar.YEAR,2016); // Set the value of the calendar field.
        c.add(Calendar.YEAR,5); // According to the rules of the calendar, add or subtract the specified amount of time to give a given calendar field.
        System.out.println(c.get(Calendar.YEAR)); // Return to the value of the calendar field.
        Date m=c.getTime(); // Returns a Date object that means this Calendar time value (from the chant to the current millisecond offset).
        System.out.println(l.format(m));
        Calendar d=Calendar.getInstance();
        d.set(Calendar.YEAR,2004);
        d.set(Calendar.MONTH,2);

        int k=c.getTime().getDay();

    }
}