打印日历

package test;

import java.util.*;

public class CalendarTest {


	public static void main(String[] args) 
	{
		// construct d as current date
		//此日历对象表示了默认地区的默认时区的当前时间。
		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);

		// print heading
		System.out.println("Sun	Mon	Tue	Wed	Thu	Fri	Sat");
		
		// indent (缩排) first line of calendar
		for (int i = Calendar.SUNDAY; i < weekday; i++)
		{
			System.out.print("\t");
		}
		
		do
		{
			// print day
			int day = d.get(Calendar.DAY_OF_MONTH);
			if (day < 10) System.out.print(" ");
			
			System.out.print(day);
			
			// mark current day with *
			if (day == today)
			{
				System.out.print("*\t");
			}
			else
			{
				System.out.print("\t");
			}
			
			//start a new line after every Saturday
       		if (weekday == Calendar.SATURDAY)
			{
				System.out.println();
			}
			
			// advance d to the next day
			d.add(Calendar.DAY_OF_MONTH, 1);
			weekday = d.get(Calendar.DAY_OF_WEEK);
		}
		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 != Calendar.SUNDAY)
		{
			System.out.println();
		}	
	}
}

   打印效果：

Sun	Mon	Tue	Wed	Thu	Fri	Sat
			 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	31