JAVA 打印日历 初学者笔记

import java.time.*;

/**
 * @version 1.5 2015-05-08
 * @author Cay Horstmann
 */
public class ClaendarTest
{
    public static void main(String[] args)
    {
        LocalDate date = LocalDate.now();//构建此对象时默认为该年该月1号
        int month = date.getMonthValue();
        int today = date.getDayOfMonth();

        date = date.minusDays(today - 1); // 将date设置为这个月的第一天
        DayOfWeek weekday = date.getDayOfWeek();//获取第一天date是星期几
        int value = weekday.getValue(); // 将星期以数值形式表达：1 = Monday, . . . , 7 = Sunday

        System.out.println("Mon Tue Wed Thu Fri Sat Sun");
        for (int i = 1; i < value; i++)//循环打印日历前的缩进
            System.out.print("    ");
        while (date.getMonthValue() == month)//仅当月份为当月
        {
            System.out.printf("%3d", date.getDayOfMonth());
            if (date.getDayOfMonth() == today)
                System.out.print("*");//是当日则在日期后加*号
            else
                System.out.print(" ");
            date = date.plusDays(1);//将日期设置为之后的一天
            if (date.getDayOfWeek().getValue() == 1) System.out.println();
            //判断date是否为星期1，若为星期一则换行（为了日历的格式）
        }
        if (date.getDayOfWeek().getValue() != 1) System.out.println();
    }
}