老师，这个运行不成功是怎么回事
package com.xin.test;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class TestCalendar {
public static void main(String[] args) {
//得到相关日期元素
GregorianCalendar calendar = new GregorianCalendar(2999, 10, 9, 22, 10, 50);
int year = calendar.get(Calendar.YEAR);//打印：2999
int month = calendar.get(Calendar.MONTH);//打印：10
int day = calendar.get(Calendar.DAY_OF_MONTH);//打印：9
int day2 = calendar.get(Calendar.DATE);//打印：9
//日：Calender.DATE和Calender.DAY_OF_MONTH同义
int date = calendar.get(Calendar.DAY_OF_WEEK);//打印3
//星期几这里是：周日是1，周一是2，。。。周六是7
System.out.println(year);
System.out.println(month);
System.out.println(day);
System.out.println(day2);
System.out.println(date);
//设置日期
GregorianCalendar calendar2 = new GregorianCalendar();
calendar2.set(Calendar.YEAR, 2999);
calendar2.set(Calendar.MONTH, Calendar.FEBRUARY);
calendar2.set(Calendar.DATE, 3);
calendar2.set(Calendar.HOUR_OF_DAY, 10);
calendar2.set(Calendar.MINUTE, 20);
calendar2.set(Calendar.SECOND, 23);
printCalendar(calendar2);
//日期计算
GregorianCalendar calendar3 = new GregorianCalendar(2999, 10, 9, 22, 10, 50);
calendar3.add(Calendar.MONTH, -7);//月份减7
calendar3.add(Calendar.DATE, 7);//增加7天
printCalendar(calendar3);
//日历对象和时间对象转化
Date d = calendar3.getTime();
GregorianCalendar calendar4 = new GregorianCalendar();
calendar4.setTime(new Date());
}
static void printCalendar(Calendar calendar) {
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH) + 1;
int day = calendar.get(Calendar.DAY_OF_MONTH);
int date = calendar.get(Calendar.DAY_OF_WEEK) - 1;//星期几
String week = "" + ((date == 0) ? "日" : date);
int hour = calendar.get(Calendar.HOUR);
int minute = calendar.get(Calendar.MINUTE);
int second = calendar.get(Calendar.SECOND);
System.out.printf("%d年%d月%d日,星期%s %d:%d:%d\n", year, month, week, day, hour, minute, second);
}
}
老师，这个解决HttpSession被反复销毁实质就是在HttpSession到时间自动销毁前，将它提前销毁了吗，还是说它自动销毁后还有什么它存在的信息没删除干净
老师 我这每回写代码都蹦出这个 红字 请求老师指教 运行不了
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