java简单日历_java简易日历-优快云博客

本文介绍了一个使用Java编写的程序，该程序能够打印指定月份的日历，并标记当前日期。通过利用`GregorianCalendar`和`DateFormatSymbols`等类，程序实现了获取和显示一周中的每一天名称、确定月份的第一天是周几、并正确对齐每月日期的功能。

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import java.text.DateFormatSymbols; import java.util.*; /** * @version 1.4 2007-04-07 * @author Cay Horstmann */ public class CalendarTest { public static void main(String[] args) { // construct d as current date GregorianCalendar d = new GregorianCalendar(); int today = d.get(Calendar.DAY_OF_MONTH); int month = d.get(Calendar.MONTH); // set d to start date of the month d.set(Calendar.DAY_OF_MONTH, 1); int weekday = d.get(Calendar.DAY_OF_WEEK); // get first day of week (Sunday in the U.S.) int firstDayOfWeek = d.getFirstDayOfWeek(); // determine the required indentation for the first line int indent = 0; while (weekday != firstDayOfWeek) { indent++; 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 = 1; i <= indent; i++) System.out.print(" "); d.set(Calendar.DAY_OF_MONTH, 1); do { // print day int day = d.get(Calendar.DAY_OF_MONTH); System.out.printf("%5d", 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.MONTH) == month); // the loop exits when d is day 1 of the next month // print final end of line if necessary if (weekday != firstDayOfWeek) System.out.println(); } }

结果：

run: 星期日星期一星期二星期三星期四星期五星期六 1 2* 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 成功生成（总时间：1 秒）