ht-1 jdk calendar类

 package calendardemo;

 import java.util.Calendar;

 public class CalendarDemo {

     /**
      * @param args
      */
     public static void main(String[] args) {
         Calendar calendar = Calendar.getInstance();
         // Calendar类是抽象类
         // 通过Calendar类的静态方法Calendar来获得一个日历类对象，获得的是Calendar类的子类对象GregorianCalendar
         System.out.println(calendar); // 输出默认的toString方法的格式
         System.out.println(calendar.get(Calendar.YEAR));
         System.out.println(calendar.get(Calendar.MONTH) + 1);
         System.out.println(calendar.get(Calendar.DATE));
         System.out.println(calendar.get(Calendar.HOUR_OF_DAY)); // HOUR_OF_DAY24小时制的小时时间
         System.out.println(calendar.get(Calendar.MINUTE));
         System.out.println(calendar.get(Calendar.SECOND));
         calendar.set(Calendar.YEAR, 2016); // 设置时间
         System.out.println(calendar.get(Calendar.YEAR));
         System.out.println(calendar.getTimeInMillis()); // 得到1970年1月1日00:00:00.000以来的毫秒数

     }

 }

输出结果：

java.util.GregorianCalendar[time=1532758612771,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Shanghai",offset=28800000,dstSavings=0,useDaylight=false,transitions=19,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2018,MONTH=6,WEEK_OF_YEAR=30,WEEK_OF_MONTH=4,DAY_OF_MONTH=28,DAY_OF_YEAR=209,DAY_OF_WEEK=7,DAY_OF_WEEK_IN_MONTH=4,AM_PM=1,HOUR=2,HOUR_OF_DAY=14,MINUTE=16,SECOND=52,MILLISECOND=771,ZONE_OFFSET=28800000,DST_OFFSET=0]
2018
7
28
14
16
52
2016
1469686612771