28.4 Calendar 日历

/*
* Calendar：日历，提供了一些操作年月日时的方法
* 获取
* 修改
* 添加
*/

public class CalendarDemo {
    public static void main(String[] args) {
        Calendar c = Calendar.getInstance();

        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH) + 1; //月份是从0开始计起，所以当前月应该+1
        int day = c.get(Calendar.DAY_OF_MONTH);
        System.out.println(year+","+month+","+day);


        c.set(Calendar.DAY_OF_MONTH,2);//把指定的字段修改成指定的值
        int day2 = c.get(Calendar.DAY_OF_MONTH);
        System.out.println(day2);

        c.add(Calendar.DAY_OF_MONTH,15);//在指定的字段上加上指定的值
        int day3 = c.get(Calendar.DAY_OF_MONTH);
        System.out.println(day3);
    }
}

输出