09java.util.Calendar()类（jdk8之前结束）

/*
    Calendar 日历类的使用
     */
    @Test
    public void testCalendar(){
        //1.实例化：
        //方式一：创建其子类GregorianCalendar的对象：
            //GregorianCalendar gregorianCalendar = new GregorianCalendar();
        //方式二：调用其静态方法：getCalendar()
        Calendar calendar = Calendar.getInstance();
        System.out.println(calendar.getClass());

        //2.常用方法
        //get()获取
        int days = calendar.get(Calendar.DAY_OF_MONTH);
        System.out.println(days);
        System.out.println(calendar.get(Calendar.DAY_OF_YEAR));
        //set()设定
        calendar.set(Calendar.DAY_OF_MONTH,22);
        days = calendar.get(Calendar.DAY_OF_MONTH);
        System.out.println(days);

        //add在原有基础上添加
            //calendar.add(Calendar.DAY_OF_MONTH,9);
        calendar.add(Calendar.DAY_OF_MONTH,5);
        days = calendar.get(Calendar.DAY_OF_MONTH);
        System.out.println(days);

        //getTime() 日历类----》Date
        Date date = calendar.getTime();
        System.out.println(date);

        //setTime() Date---->日历类
        Date date1 = new Date();
        calendar.setTime(date1);
        days = calendar.get(Calendar.DAY_OF_MONTH);
        System.out.println(days);

    }
}