用GregorianCalendar类打印日历

最新推荐文章于 2022-09-16 14:57:31 发布

xiongchao2011

最新推荐文章于 2022-09-16 14:57:31 发布

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分类专栏： Java 文章标签：日历 import string date class

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本文展示了如何使用Java编程语言，通过Calendar类和DateFormatSymbols接口，打印出月历的详细步骤。包括获取当前日期、月份、星期起始日等信息，并在输出中突出显示今天的日期。

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import java.text.*;
import java.util.*;

public class CalendarTest {
	public static void main(String[] args) {
		Locale.setDefault(Locale.ENGLISH);

		// construct d as current date
		GregorianCalendar d = new GregorianCalendar();

		int today = d.get(Calendar.DAY_OF_MONTH); // current date
		int month = d.get(Calendar.MONDAY); // current month

		// set d to start date of the month (将d设置为这个月的第一天)
		d.set(Calendar.DAY_OF_MONTH, 1);

		int weekday = d.get(Calendar.DAY_OF_WEEK); // 获取第一天的星期

		// get first day of week (Sunday in the U.S.) 星期的起始日
		int firstDayOfWeek = d.getFirstDayOfWeek(); // 1

		// determine the required indentation for the first line
		// 将日历对象的日减1，直到一个星期的第一天为止
		int index = 0;
		while (weekday != firstDayOfWeek) {
			index++;
			d.add(Calendar.DAY_OF_MONTH, -1);
			weekday = d.get(Calendar.DAY_OF_WEEK);
		}

		// print weekday names
		String[] weekdayNames = new DateFormatSymbols().getShortWeekdays();
		do {
			System.out.printf("%4s", weekdayNames[weekday]);
			d.add(Calendar.DAY_OF_MONTH, 1);
			weekday = d.get(Calendar.DAY_OF_WEEK);
		} while (weekday != firstDayOfWeek);
		System.out.println();

		for (int i = 0; i < index; i++)
			System.out.print("    ");

		d.set(Calendar.DAY_OF_MONTH, 1);
		do {
			// print day
			int day = d.get(Calendar.DATE);
			System.out.printf("%3d", day);

			// mark current day with*
			if (day == today)
				System.out.print("*");
			else
				System.out.print(" ");

			// advance d to the next day
			d.add(Calendar.DAY_OF_MONTH, 1);
			weekday = d.get(Calendar.DAY_OF_WEEK);

			// start a new line at the start of the week
			if (weekday == firstDayOfWeek)
				System.out.println();
		} while (d.get(Calendar.MONDAY) == month);
		// the loop exits when d is day 1 of the next month

		// print final end of the line if necessary
		if (weekday != firstDayOfWeek)
			System.out.println();
	}
}