当前月日历表（Java, Python两种语言实现）

Java

需要确定文件名（main函数所在类名于文件名一致才能编译）
文件名： Test.java

import java.time.DayOfWeek;
import java.time.LocalDate;

public class Test {
    public static void main(String[] args) {
        LocalDate date = LocalDate.now();
        int month = date.getMonthValue();
        int today = date.getDayOfMonth();

        date = date.minusDays(today - 1); // the first day of the month
        DayOfWeek week = date.getDayOfWeek();
        int value = week.getValue();

        System.out.println("Mon Tue Wed Thu Fri Sat Sun");
        for (int i = 0; i < 4*value - 4;++i)
            System.out.print(' ');
        while (date.getMonthValue() == month) {
            System.out.printf("%3d", date.getDayOfMonth());
            if (date.getDayOfMonth() == today)
                System.out.print('*');
            else
                System.out.print(' ');
            date = date.plusDays(1);
            if (date.getDayOfWeek().getValue() == 1) System.out.println();
        }
        if (date.getDayOfWeek().getValue() != 1) System.out.println();
    }
}

Python

from datetime import *
today = date.today()
month = today.month
day = today.day
week = today.weekday() + 1

firstday = today.replace(day=1)
firstdayWeek = firstday.weekday() + 1

print("Mon Tue Wed Thu Fri Sat Sun")
for i in range(4 * firstdayWeek - 4):
    print(' ', end='')

while firstday.month == month:
    print("%3d" % firstday.day, end='')
    if firstday.day == day:
        print('*', end='')
    else:
        print(' ', end='')
    firstday += timedelta(days=1)
    if firstday.weekday() == 0:
        print()

if firstday.day != 0:
    print()

效果

Mon Tue Wed Thu Fri Sat Sun
                          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*