日历打印小程序

小程序代码：

import java.util.Calendar;
import java.util.GregorianCalendar;

public class StudyTest1 {
public static void main(String[] args) {
Calendar aCalender = new GregorianCalendar();
int month = aCalender.get(Calendar.MONTH);
int today = aCalender.get(Calendar.DAY_OF_MONTH);

aCalender.set(Calendar.DAY_OF_MONTH, 1);
int weekDay = aCalender.get(Calendar.DAY_OF_WEEK);

System.out.println("SUN MON TUE WED THU FRI SAT");

for(int i=Calendar.SUNDAY; i<weekDay; i++) {
System.out.println("    ");
}

do {
int day = aCalender.get(Calendar.DAY_OF_MONTH);

System.out.printf("%3d", day);

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

if(weekDay == Calendar.SATURDAY) {
System.out.println();
}

aCalender.add(Calendar.DAY_OF_MONTH, 1);
weekDay = aCalender.get(Calendar.DAY_OF_WEEK);

} while (aCalender.get(Calendar.MONTH) == month);

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