Java Calendar 类的时间操作 原

package com.zhaogang.test;

import org.junit.Test;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * Created by weixiang.wu on 2017/9/26.
 */
public class CalendarTest {

    @Test
    public void CalendarTest1() {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");
        Calendar cal = Calendar.getInstance(); // 初始化

        int year = cal.get(Calendar.YEAR);//年
        int month = cal.get(Calendar.MONTH) + 1;//月
        int day = cal.get(Calendar.DATE);//日
        int hour = cal.get(Calendar.HOUR_OF_DAY);//时
        int minute = cal.get(Calendar.MINUTE);//分
        int second = cal.get(Calendar.SECOND);//秒
        int weekday = cal.get(Calendar.DAY_OF_WEEK);//星期   周日-周六对应1-7
        int last = cal.getActualMaximum(cal.DAY_OF_MONTH); // 获取本月最大天数
        int DAY_OF_YEAR = cal.get(Calendar.DAY_OF_YEAR);//今年的第几天
        int DAY_OF_MONTH = cal.get(Calendar.DAY_OF_MONTH);//本月的第几天
        System.out.println("现在是: " + year + " 年 " + month + " 月 " + day +
                " 日 " + hour + " 时 " + minute + " 分 " + second + " 秒 " + "\nweekday: " + weekday
                + " 本月天数 :" + last + " 今年的第几天:" + DAY_OF_YEAR + " 本月第几天:" + DAY_OF_MONTH);

        cal.set(2013, 5, 4, 13, 44, 51);//年月日时分秒（月份0代表1月）  ，毫秒不会自动清零
        System.out.println(sdf.format(cal.getTime()));
        cal.set(Calendar.MILLISECOND, 0);//毫秒清零
        System.out.println(sdf.format(cal.getTime()));
        cal.set(Calendar.YEAR, 2014);//年
        cal.set(Calendar.MONTH, 7);//月（月份0代表1月）
        cal.set(Calendar.DATE, 11);//日
        cal.set(Calendar.HOUR_OF_DAY, 15);//时
        cal.set(Calendar.MINUTE, 33);//分
        cal.set(Calendar.SECOND, 32);//秒
        System.out.println(sdf.format(cal.getTime()));

        cal.setTime(new Date());
        System.out.println(sdf.format(cal.getTime()));

        cal.add(Calendar.YEAR, 1);//年
        cal.add(Calendar.MONTH, 1);//月
        cal.add(Calendar.DATE, 1);//日
        cal.add(Calendar.HOUR_OF_DAY, -1);//时
        cal.add(Calendar.MINUTE, 1);//分
        cal.add(Calendar.SECOND, 1);//秒
        System.out.println(sdf.format(cal.getTime()));

        Calendar calendarNew = Calendar.getInstance();
        calendarNew.add(Calendar.HOUR, -2);
        System.out.println("时间比较：" + calendarNew.compareTo(cal));
    }

}