day18/CalendarDemo2.java

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/*Calendar是一个抽象类c.set(2020,11,12);设置日历字段 YEAR、MONTH 和 DAY_OF_MONTH 的值c.add(Calendar.MONTH,-5);根据日历的规则，为给定的日历字段添加或减去指定的时间量*/import java.util.*;class CalendarDemo2 {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。c.set(2020,11,12);//月是从0-11printCalendar(c);c.add(Calendar.MONTH,-5);printCalendar(c);}public static void printCalendar(Calendar c){//查表，获取月String[] mons = {"一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"};int index=c.get(Calendar.MONTH);sop(mons[index]);//查表，获取星期String[] days={"","星期日","星期一","星期二","星期三","星期四","星期五","星期六"};int index1 = c.get(Calendar.DAY_OF_WEEK);sop(days[index1]);}}

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