java控制臺打印本月的日歷

import java.time.LocalDate;

public class TestScanner {

  public static void main(String[] args) {
    rili();
  }

  private static void rili() {

    System.out.println(" Mon Tue Web Thu Fri Sta Sun");
    //獲取當前日期
    LocalDate now = LocalDate.now();
    //獲取當前月份
    int nowMonth = now.getMonthValue();
    //獲取今天是幾號
    int nowDay = now.getDayOfMonth();
    //在外部設置一個月份的變量，用于與當前月份進行判斷
    int dayOfMonth = nowMonth;
    //獲取本月月初的日期
    now = now.minusDays(nowDay - 1);
    //獲取月初是星期幾
    int firstWeek = now.getDayOfWeek().getValue();
    String blank = "";
    for(int i = 0; i < firstWeek; i++) {
      blank += "  ";
    }
    //如果1號是星期一的話前面添加三個空格
    if(firstWeek != 1) {
      //截取最后一個空格用于存放日期，不然的話會錯位
      blank = blank.substring(0, blank.length() - 1);
    } else {
      blank = "  ";
    }
    //打印日期
    System.out.print(blank + now.getDayOfMonth());
    //如果加1天之后的日期還是本月份的就一直打印
    while(dayOfMonth == nowMonth) {
      //加1天
      now = now.plusDays(1L);
      //獲取加1天之后的月份
      dayOfMonth = now.getMonthValue();
      //如果加一天之后的月份不等于當前月份，就直接跳出循環
      if (dayOfMonth != nowMonth) {
        break;
      }
      //判斷如果日期為雙位數，就在前面添加兩個空格，否則就添加三個空格
      if (now.getDayOfMonth() < 10) {
        //判斷加一天之后的日期是否和今天相等，如果相等就在前面加個*
        if (now.getDayOfMonth() == nowDay) {
          System.out.print(" *" + now.getDayOfMonth());
        } else {
          System.out.print("  " + now.getDayOfMonth());
        }
      } else {
        if (now.getDayOfMonth() == nowDay) {
          System.out.print(" *" + now.getDayOfMonth());
        } else {
          System.out.print(" " + now.getDayOfMonth());
        }
      }
      //獲取加一天之后的星期數
      int week = now.getDayOfWeek().getValue();
      //如果是星期日，就換行
      if (week == 7) {
        System.out.println();
      }
    }
  }


}