本實(shí)例演示 util 包中類 Calendar 的使用

Clendar 類是一種日期處理類 , 可以想像它是一個(gè)掛在墻壁上的典型日歷 , 有許多日期和頁數(shù)翻閱 .

1.?????? Clendar 類的變量域的概念 . 每個(gè)元素都是域 , 并且這些域在 Clendar 類中表現(xiàn)為靜態(tài)變量 . 這些變量域 , 可能通過 get/set 類方法獲得或者設(shè)置域值 .

[Calendardemo.java 代碼 ]:

import java.util.*;

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public class Calendardemo {

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?????? public static void main(String[] args) {

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????????????? // 創(chuàng)建一個(gè)日歷對象

????????????? Calendar calendar = Calendar.getInstance();

????????????? // 用當(dāng)前時(shí)間初始化日歷對象

????????????? calendar.setTime(new Date());

????????????? String year = String.valueOf(calendar.get(Calendar.YEAR));

????????????? String month = String.valueOf(calendar.get(Calendar.MONTH) + 1);

????????????? String date = String.valueOf(calendar.get(Calendar.DAY_OF_MONTH));

????????????? String day = String.valueOf(calendar.get(Calendar.DAY_OF_WEEK) - 1);

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????????????? int hour = calendar.get(Calendar.HOUR);// 以 12 小時(shí)制

????????????? int hour_1 = calendar.get(Calendar.HOUR_OF_DAY);// 以 24 小時(shí)制

????????????? int minute = calendar.get(Calendar.MINUTE);

????????????? int second = calendar.get(Calendar.SECOND);

????????????? // 輸出結(jié)果

????????????? System.out.println("year=? " + year);

????????????? System.out.println("month=? " + month);

????????????? System.out.println("date=? " + date);

????????????? System.out.println("day=? " + day);

????????????? System.out.println("hour=? " + hour);

????????????? System.out.println("hour1=? " + hour_1);

????????????? System.out.println("minute=? " + minute);

????????????? System.out.println("second=? " + second);

????????????? System.out.println(" 現(xiàn)在時(shí)間是： ");

????????????? System.out.println(" " + year + " 年 " + month + " 月 " + date + " 星期 " + day);

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????????????? calendar.set(1983, 7, 21);// 將日歷翻到某個(gè)時(shí)間． 7 表示八月

????????????? long time1983 = calendar.getTimeInMillis();// 返回當(dāng)前時(shí)間，作為從開始時(shí)間的 UTC 毫秒值

????????????? calendar.setTime(new Date());// 將日歷翻到現(xiàn)在這個(gè)時(shí)間．

????????????? long time2006 = calendar.getTimeInMillis();

????????????? long interdays = (time2006 - time1983) / (1000 * 60 * 60 * 24);

????????????? System.out.println(" 現(xiàn)在和 1983.8.21 相隔 " + interdays + " 天 ");

?????? }

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}

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注意 : 應(yīng)該以靜態(tài)方式訪問靜態(tài)字段 Calendar.year

運(yùn)行結(jié)果 :