吴裕雄--天生自然java开发常用类库学习笔记：日期操作类Data、Calendar

import java.util.Date ;
public class DateDemo01{
    public static void main(String args[]){
        Date date = new Date() ;    // 直接实例化Date对象
        System.out.println("当前日期为：" + date) ;
    }
};

import java.util.* ;
public class DateDemo02{
    public static void main(String args[]){
        Calendar calendar = new GregorianCalendar();    // 实例化Calendar类对象
        System.out.println("YEAR: " + calendar.get(Calendar.YEAR));
        System.out.println("MONTH: " + (calendar.get(Calendar.MONTH) + 1));
        System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH));
        System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY));
        System.out.println("MINUTE: " + calendar.get(Calendar.MINUTE));
        System.out.println("SECOND: " + calendar.get(Calendar.SECOND));
        System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND));
    }
};