用JAVA打印当前月份的日历

package Calendar;

import java.text.DateFormatSymbols;
import java.util.GregorianCalendar;
import java.util.Calendar;
import java.util.Locale;

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

GregorianCalendar d = new GregorianCalendar();
int today = d.get(Calendar.DAY_OF_MONTH);

int weekday = d.get(Calendar.DAY_OF_WEEK);
int firstDayOfWeek = d.getFirstDayOfWeek();
int month = d.get(Calendar.MONTH);

int indent = 0;
while(weekday != firstDayOfWeek)
{
indent++;
d.add(Calendar.DAY_OF_MONTH, -1);
weekday = d.get(Calendar.DAY_OF_WEEK);
}
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);

if(d.get(Calendar.MONTH) != month)
{
d.add(Calendar.MONTH, -1);
}

System.out.println();
for(int i = 0; i < indent; i++)
{
System.out.print(" ");
}
d.set(Calendar.DAY_OF_MONTH, 1);

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

if(day == today){
System.out.print("*  ");
}
else{
System.out.print("   ");
}

d.add(Calendar.DAY_OF_MONTH, 1);
weekday = d.get(Calendar.DAY_OF_WEEK);
if(weekday == firstDayOfWeek)
{
System.out.println();
System.out.print(" ");
}
}while(d.get(Calendar.MONTH) == month);
}
}