下面这个程序将显示当前月的日历，且当前日期用一个*标记，如图：

import java.time.DayOfWeek;
import java.time.LocalDate;/*** @Author Hatsune Miku* @Date 2020/6/2 11:15* @Version 1.0*/
public class CalendarTest {public static void main(String[] args) {LocalDate date = LocalDate.now();  //获得当前年月日int month = date.getMonthValue();  //获得月份int today = date.getDayOfMonth();  //获得当前是该月份的第几天//得到此月份的第一天date = date.minusDays(today - 1);   //生成当前日期之前n天的日期，当参数为负时，就是当前天的后n天DayOfWeek weekday = date.getDayOfWeek();  //获取星期几的字段，这是一个DayOfWeek类型的枚举变量int value = weekday.getValue();           //使用getValue()获得该字段对应的序列号System.out.println("Mon Tue Wed Thu Fri Sat Sun");for (int i = 1; i < value; i++)System.out.print("    ");while (date.getMonthValue() == month){System.out.printf("%3d", date.getDayOfMonth());if (date.getDayOfMonth() == today)System.out.print("*");elseSystem.out.print(" ");date = date.plusDays(1);if (date.getDayOfWeek().getValue() == 1) System.out.println();}if (date.getDayOfWeek().getValue() != 1) System.out.println();}
}