[JAVA] Create a calendar from the Calendar class by specifying the year and month

import java.util.Calendar;

public class CalendarSample {

	public static void main(String[] args) {

		int year = 2018;
		int month = 8;

		//Calendar instance creation
		Calendar cal = Calendar.getInstance();

		//Calendar settings (month- 1）
		cal.set(year, month - 1, 1);
		//Day of the week index at the beginning of the month (Sunday 1 to Saturday 7)
		int weekIndex = cal.get(Calendar.DAY_OF_WEEK);
		//Seeking the end of the month
		int monthEndDay = cal.getActualMaximum(Calendar.DATE);

		//Calendar creation
		System.out.printf("   << %4d years%2d month>>\n", year, month);
		System.out.println("Sunday Monday Tuesday Wednesday Thursday Friday Saturday");

		//Day of the week offset space
		for (int i = 1; i < weekIndex; i++) {
			System.out.print("   ");
		}

		//Output from January to the end of the month
		for (int day = 1; day <= monthEndDay; day++) {
			System.out.printf("%3d", day);

			//Line break on saturday
			if ((day + weekIndex - 1) % 7 == 0) {
				System.out.println();
			}
		}
	}
}

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