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  • Calender类——字段值介绍

    今天,看到有人这样编写代码,有点不明所以:

    Calendar calendar = Calendar.getInstance();

    calendar.get(1);

    calendar.get(2)+1;

    所以自己亲测一番:

    public class TestCalendar {
    	public static void main(String[] args) {
                 System.out.println("Calendar总字段数:" + Calendar.FIELD_COUNT);
    		System.out.println("era = " + Calendar.ERA);
    		System.out.println("year = " + Calendar.YEAR);
    		System.out.println("month = " + Calendar.MONTH);
    		System.out.println("week_of_year = " + Calendar.WEEK_OF_YEAR);
    		System.out.println("week_of_month = " + Calendar.WEEK_OF_MONTH);
    		System.out.println("date = " + Calendar.DATE);
    		System.out.println("day_of_month = " + Calendar.DAY_OF_MONTH);
    		System.out.println("day_of_year = " + Calendar.DAY_OF_YEAR);
    		System.out.println("day_of_week = " + Calendar.DAY_OF_WEEK);
    		System.out.println("day_of_week_in_month = " + Calendar.DAY_OF_WEEK_IN_MONTH);
    		System.out.println("am_pm = " + Calendar.AM_PM);
    		System.out.println("hour = " + Calendar.HOUR);
    		System.out.println("hour_of_day = " + Calendar.HOUR_OF_DAY);
    		System.out.println("minute = " + Calendar.MINUTE);
    		System.out.println("second = " + Calendar.SECOND);
    		System.out.println("millisecond = " + Calendar.MILLISECOND);
    		System.out.println("zone_offset = " + Calendar.ZONE_OFFSET);
    		System.out.println("dst_offset = " + Calendar.DST_OFFSET);   
            }
    }            
    

      测试输出:

    Calendar总字段数:17
    era = 0
    year = 1
    month = 2
    week_of_year = 3
    week_of_month = 4
    date = 5
    day_of_month = 5
    day_of_year = 6
    day_of_week = 7
    day_of_week_in_month = 8
    am_pm = 9
    hour = 10
    hour_of_day = 11
    minute = 12
    second = 13
    millisecond = 14
    zone_offset = 15
    dst_offset = 16
    

      可以看出日期类Calender的字段值都有默认的int类型的值所对应,这样只要记住这些值就可以直接用数值代替,但是感觉没有字段好用。

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  • 原文地址:https://www.cnblogs.com/zxf-java/p/9204566.html
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