day18/CalendarDemo.java

/*Calendar是一个抽象类*/import java.util.*;class CalendarDemo {public static void sop(Object obj){System.out.println(obj);}public static void main(String[] args) {Calendar c = Calendar.getInstance();//static Calendar getInstance() 使用默认时区和语言环境获得一个日历。sop(c.get(Calendar.YEAR));//字段YEAR所属的类是Calendar}}