显示本月日历demo

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

public class TestCalendar {
public static void main(String[] args) {
	GregorianCalendar now=new GregorianCalendar();
	int month=now.get(Calendar.MONTH);
	int today=now.get(Calendar.DAY_OF_MONTH);
	int intent=0;
	now.set(Calendar.DAY_OF_MONTH, 1);
	int week=now.get(Calendar.DAY_OF_WEEK);
	int firstDayOfWeek=now.getFirstDayOfWeek();
	while(firstDayOfWeek!=week){
		++intent;
		now.add(Calendar.DAY_OF_MONTH, -1);
		week=now.get(Calendar.DAY_OF_WEEK);
	}
	String[] weekdayName=new DateFormatSymbols().getShortWeekdays();
	do{
		System.out.printf("%4s",weekdayName[week]);
		now.add(Calendar.DAY_OF_MONTH, 1);
		week=now.get(Calendar.DAY_OF_WEEK);
	}while(week!=firstDayOfWeek);
	System.out.println();
	for(int i=0;i<intent;i++){
		System.out.println("    ");
	}
	now.set(Calendar.DAY_OF_MONTH, 1);
	week=now.get(Calendar.DAY_OF_WEEK);
	int day=now.get(Calendar.DAY_OF_MONTH);
	do{
		System.out.printf("%4s", day);
		if(today==day){
			System.out.print("*");
		}else {
			System.out.print(" ");
		}
		now.add(Calendar.DAY_OF_MONTH, 1);
		week=now.get(Calendar.DAY_OF_WEEK);
		day=now.get(Calendar.DAY_OF_MONTH);
		if(week==firstDayOfWeek){
			System.out.println();
		}
	}while(month==now.get(Calendar.MONTH));
	if(week!=firstDayOfWeek){
		System.out.println();
	}
}
}