java 输出当月日历

package codejava;

import java.util.*;

public class CalendarTest {
 public static void main(String[] args) {
  // construct d as current date
  GregorianCalendar d = new GregorianCalendar();

  int today = d.get(Calendar.DAY_OF_MONTH);
  int month = d.get(Calendar.MONTH);

  // set d to start date of the month
  d.set(Calendar.DAY_OF_MONTH, 1);

  int weekday = d.get(Calendar.DAY_OF_WEEK);

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

  // indent first line of calendar
  for (int i = Calendar.SUNDAY; i < weekday; i++)
   System.out.print("    ");

  do {
   // print day
   int day = d.get(Calendar.DAY_OF_MONTH);
   System.out.printf("%3d", day);

   // mark current day with *
   if (day == today)
    System.out.print("*");
   else
    System.out.print(" ");

   // start a new line after every Saturday
   if (weekday == Calendar.SATURDAY)
    System.out.println();

   // advance d to the next day
   d.add(Calendar.DAY_OF_MONTH, 1);
   weekday = d.get(Calendar.DAY_OF_WEEK);
  } while (d.get(Calendar.MONTH) == month);
  // the loop exits when d is day 1 of the next month

  // print final end of line if necessary
  if (weekday != Calendar.SUNDAY)
   System.out.println();
 }
}
 

### 实现打印当前月份日历功能 为了实现打印当前月份的日历,可以利用 `java.time` 包中的类来获取当前日期信息,并通过简单的算法构建一个月视图。下面是一个完整的例子: ```java import java.time.LocalDate; import java.time.DayOfWeek; import java.time.temporal.TemporalAdjusters; import java.util.Calendar; public class CalendarPrinter { public static void main(String[] args) { printMonthCalendar(); } private static void printMonthCalendar() { LocalDate now = LocalDate.now(); // 获取当月第一天和最后一天 LocalDate firstDayOfMonth = now.with(TemporalAdjusters.firstDayOfMonth()); LocalDate lastDayOfMonth = now.with(TemporalAdjusters.lastDayOfMonth()); System.out.println("Sun Mon Tue Wed Thu Fri Sat"); DayOfWeek weekStart = firstDayOfMonth.getDayOfWeek(); // 打印前导空白字符直到第一个星期天 for (int i = 0; i < weekStart.getValue(); i++) { System.out.print(" "); } while (!firstDayOfMonth.isAfter(lastDayOfMonth)) { System.out.printf("%3d ", firstDayOfMonth.getDayOfMonth()); if (firstDayOfMonth.getDayOfWeek() == DayOfWeek.SATURDAY) { System.out.println(); } firstDayOfMonth = firstDayOfMonth.plusDays(1); } System.out.println(); // 输出最后一行可能未满的一周 } } ``` 这段代码首先导入必要的包并定义了一个名为 `CalendarPrinter` 的公共类[^1]。该程序会自动计算当前月份的第一天以及结束于哪一天,并按照每周七天的形式排列输出每一天的日期。
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值