Calendar类

Calendar类：是日历类，有不少静态方法。

import java.util.Calendar;
import java.util.Date;
public class Calendardemo {
    public static void main(String[] args) {
        //Calendar类的方法getTime()
        Calendar c1 = Calendar.getInstance();//不须要直接new 子类的对象,经过静态方法直接获取
        Date date = c1.getTime();//把日历对象,转成Date日期对象
        System.out.println(date);
        
        Calendar c2 = Calendar.getInstance();
        c2.add(Calendar.DAY_OF_MONTH, -300);// 让日历中的天数向后偏移300天
        int year = c2.get(Calendar.YEAR);//年
        int month = c2.get(Calendar.MONTH) + 1;//月，月份从零开始，因此月份要加1
        int day = c2.get(Calendar.DAY_OF_MONTH);//日
        System.out.println(year + "年" + month + "月" + day + "日");
        
        Calendar c3 = Calendar.getInstance();
        c3.set(2099, 4, 1);
        int year1 = c3.get(Calendar.YEAR);//年
        int month1 = c3.get(Calendar.MONTH) + 1;//月
        int day1 = c3.get(Calendar.DAY_OF_MONTH);//日
        System.out.println(year1 + "年" + month1 + "月" + day1 + "日");
        
        Calendar c4 = Calendar.getInstance();
        int year2 = c4.get(Calendar.YEAR);//年
        int month2 = c4.get(Calendar.MONTH) + 1;//月
        int day2 = c4.get(Calendar.DAY_OF_MONTH);//日
        System.out.println(year2 + "年" + month2 + "月" + day2 + "日");
        
        Calendar c5= Calendar.getInstance();
        System.out.println("年:" + c5.get(Calendar.YEAR));
        System.out.println("月:" + (c5.get(Calendar.MONTH) + 1));       
        System.out.println("日:" + c5.get(Calendar.DAY_OF_MONTH));
        System.out.println("时:" + c5.get(Calendar.HOUR_OF_DAY));
        System.out.println("分:" + c5.get(Calendar.MINUTE));
        System.out.println("秒:" + c5.get(Calendar.SECOND));
    }
}