（PASS）java中打印当月的日历的每一天

 

package test;

import java.time.DayOfWeek;
import java.time.LocalDate;
/**
 *
 * @ClassName: CalendarTest
 * @Description: 用来打印当月的日历
 * @author William_Dai
 * @date 2019年5月21日
 *
 */

public class CalendarTest {
    public static void main(String[] args) {
        LocalDate date = LocalDate.now();
        //System.out.println(date);  // 输出结果： 2019-05-21

        int month = date.getMonthValue();
        int today = date.getDayOfMonth();
        //System.out.println(month +"***"+today ); // 输出结果： 5***21

        date = date.minusDays(today - 1); //设置为一个月的第一天 : 2019-05-01
        //date = date.minusDays(today); // 2019-04-10
        //System.out.println(date);

        DayOfWeek weekday = date.getDayOfWeek();
        //System.out.println(weekday); // WEDNESDAY

        int value = weekday.getValue();
        //System.out.println(value); // 输出： 3 (the day-of-week, from 1 (Monday) to 7 (Sunday))

       System.out.println("Mon Tue Wed Thu Fri Sat Sun");

        for(int i = 1 ; i < value; i ++){
            System.out.print("    ");
        }
        //System.out.println(date.getMonthValue());//5
        //System.out.println(month); //5

         //System.out.print(date.getDayOfMonth()); // 1
         //System.out.printf("%3d",date.getDayOfMonth());
         //date = date.plusDays(1); // 加一天
         //System.out.printf("%3d",date.getDayOfMonth());
          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();
            }
        }
        //System.out.println(date.getDayOfWeek().getValue());
        if(date.getDayOfWeek().getValue() != 1){
            System.out.println();
        }
      }
}

输出结果是：当天日期是 21号。