读出日历
　　　　　int year = cal.get(Calendar.YEAR);

        int month = cal.get(Calendar.MONTH)+1;

        int date1 = cal.get(Calendar.DATE);

        int date2 = cal.get(Calendar.DAY_OF_MONTH);

        int hour1 = cal.get(Calendar.HOUR);

        int hour2 = cal.get(Calendar.HOUR_OF_DAY);

        int min = cal.get(Calendar.MINUTE);

        int sec = cal.get(Calendar.SECOND);

        //毫秒

        int millSec = cal.get(Calendar.MILLISECOND);

        //一年的第几天

        int dayIndex = cal.get(Calendar.DAY_OF_YEAR);

        //一年的第几周

        int weekIndex = cal.get(Calendar.WEEK_OF_YEAR);

        //一个月的第几周

        int weekIndex2 = cal.get(Calendar.WEEK_OF_MONTH);

        //一周的第几天

        int  weekIndex3 = cal.get(Calendar.DAY_OF_WEEK);

写入日历

cal.set(Calendar.YEAR, 2019);
cal.set(Calendar.MONTH, 9);
cal.set(Calendar.DATE, 28);
cal.set(Calendar.DAY_OF_MONTH, 28);

/**

 * 和Date之间的相互转换

 * Calendar---》Date  getTime()

 * Date --->Calendar  setTime()

 * @author Administrator

 *

 */

public class TestCalendar07 {

    public static void main(String[] args) {

        Calendar cal = new GregorianCalendar();

        Date date = cal.getTime();

        System.out.println("date对象："+date);

        System.out.println("============================");

        Date date2 = new Date();

        cal.setTime(date2);

        System.out.println("日历对象："+cal);

    }

}