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1，Calendar类的概述

• Calendar 类是一个抽象类，它为特定瞬间与一组诸如 YEAR、MONTH、DAY_OF_MONTH、HOUR 等日历字段之间的转换提供了一些方法，并为操作日历字段（例如获得下星期的日期）提供了一些方法。

2，成员方法

• public static Calendar getInstance()     

• public int get(int field)

• public void add(int field,int amount)        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。

• public final void set(int year,int month,int date)     设置日历字段 YEAR、MONTH 和 DAY_OF_MONTH 的值。

    public static void main(String[] args) {

        Calendar c = Calendar.getInstance();        //父类引用指向子类对象

        //System.out.println(c);                    //证明重写了toString方法打印了对象中所有的属性

        System.out.println(c.get(Calendar.YEAR));      //通过字段获取对应的值

        System.out.println(c.get(Calendar.MONTH));

    }

3，Calendar类的成员方法使用

import java.util.Calendar;public class Demo9_Calendar {public static void main(String[] args) {//demo1();Calendar c = Calendar.getInstance();            //父类引用指向子类对象//c.add(Calendar.MONTH, -1);                    //对指定的字段进行向前减或向后加//c.set(Calendar.YEAR, 2000);                    //修改指定字段c.set(2000, 7, 8);System.out.println(c.get(Calendar.YEAR) + "年" + getNum((c.get(Calendar.MONTH)+1))+ "月" + getNum(c.get(Calendar.DAY_OF_MONTH)) + "日" + getWeek(c.get(Calendar.DAY_OF_WEEK)));}public static void demo1() {Calendar c = Calendar.getInstance();            //父类引用指向子类对象//System.out.println(c);System.out.println(c.get(Calendar.YEAR));        //通过字段获取年System.out.println(c.get(Calendar.MONTH));        //通过字段后期月,但是月是从0开始编号的System.out.println(c.get(Calendar.DAY_OF_MONTH));//月中的第几天System.out.println(c.get(Calendar.DAY_OF_WEEK));//周日是第一天,周六是最后一天System.out.println(c.get(Calendar.YEAR) + "年" + getNum((c.get(Calendar.MONTH)+1))+ "月" + getNum(c.get(Calendar.DAY_OF_MONTH)) + "日" + getWeek(c.get(Calendar.DAY_OF_WEEK)));}/** 将星期存储表中进行查表* 1,返回值类型String* 2,参数列表int week*/public static String getWeek(int week) {String[] arr = {"","星期日","星期一","星期二","星期三","星期四","星期五","星期六"};return arr[week];}/** 如果是个数数字前面补0* 1,返回值类型String类型* 2,参数列表,int num*/public static String getNum(int num) {/*if(num > 9) {return "" + num;}else {return "0" + num;}*/return num > 9 ? "" + num : "0" + num;}}