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CalendarTest.java
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CalendarTest.java
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import java.text.DateFormatSymbols;
import java.util.*;
/**
* @author youkpter
*2014年 09月 18日 星期四 18:32:52 CST
*/
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);
int year = d.get(Calendar.YEAR);
System.out.println("\t" + month + "月\t" + year);
//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
{//getShortWeekdays()方法生成的String型数组是以星期几(本质就是数值常量,星期日为1)
//为索引,测试得到weekdayNames[0]为空
//所以此循环可以直接用for each循环代替
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("%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.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();
}
}