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【Java】打印日历

作者:培政 / 发布于2015/4/14/ 489


	package test;
	
	import java.text.DateFormatSymbols;
	import java.util.Calendar;
	import java.util.GregorianCalendar;
	
	public class ThisMonth {
	 /**
	 * @param args
	 */
	 public static void main(String[] args) {
	 GregorianCalendar now = new GregorianCalendar();
	 int today = now.get(Calendar.DAY_OF_MONTH); // 当前日
	 int month = now.get(Calendar.MONTH); // 当前月
	 now.set(Calendar.DAY_OF_MONTH, 1); // 设置now为这个月的第一天
	 int weekday = now.get(Calendar.DAY_OF_WEEK);// 得到这一天是星期几
	 int firstDayOfWeek = now.getFirstDayOfWeek();// 获得当前地区星期的起始日
	 int indent = 0;
	 // 确定需要缩进的距离，将日历对象减1，直到一个星期的第一天为止
	 while (weekday != firstDayOfWeek) {
	 indent++;
	 now.add(Calendar.DAY_OF_MONTH, -1);
	 weekday = now.get(Calendar.DAY_OF_WEEK);
	 }
	
	 // 输出星期几名称
	 String[] weekdayNames = new DateFormatSymbols().getShortWeekdays();
	 do {
	 System.out.printf("%4s", weekdayNames[weekday]);
	 now.add(Calendar.DAY_OF_MONTH, 1);
	 weekday = now.get(Calendar.DAY_OF_WEEK);
	 } while (weekday != firstDayOfWeek);
	 System.out.println();
	 for (int i = 1; i <= indent; i++)
	 System.out.print(" ");
	 now.set(Calendar.DAY_OF_MONTH, 1);
	 do {
	 // print day
	 int day = now.get(Calendar.DAY_OF_MONTH);
	 System.out.printf("%3d", day);
	
	 // mark current day with *
	 if (day == today)
	 System.out.print("* ");
	 else
	 System.out.print(" ");
	
	 // advance now to the next day
	 now.add(Calendar.DAY_OF_MONTH, 1);
	 weekday = now.get(Calendar.DAY_OF_WEEK);
	 if (weekday == firstDayOfWeek)
	 System.out.println();
	
	 } while (now.get(Calendar.MONTH) == month);
	
	 if (weekday != firstDayOfWeek)
	 System.out.println();
	 }
	}

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