Exception in thread "main" java.lang.Error: Unresolved compilation problem:

[ldm0703]

import java.time.*;

package day04;


public class Calendar
{
public static void main(String[] args)
{
LocalDate date = LocalDate.now();
int month = date.getMonthValue();
int today = date.getDayOfMonth();

date = date.minusDays(today - 1);//set to start of month
DayOfWeek weekday = date.getDayOfWeek();
int value = weekday.getValue();//1=monday,...,7=sunday

System.out.println("Mon Tue Wed Thu Fri Sat Sun");
for(int i = 0;i < value;i++)
System.out.println(" ");
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();
}
if (date.getDayOfWeek().getValue() != 1)
System.out.println();
}

}
编译报警：
Exception in thread "main" java.lang.Error: Unresolved compilation problem:

at day04.Calendar.main(Calendar.java:13)

清空过Project也没用，请各路大神指教。

[走一步-再走一步]

导入放到包下面

[走一步-再走一步]

package day04; import java.time.DayOfWeek; import java.time.LocalDate;

[hp961218]

System.out.printf("%3d",date.getDayOfMonth());这句话是什么鬼