日历类的add()方法 (Calendar Class add() method)

• add() method is available in java.util package.

  add()方法在java.util包中可用。

• add() method is used to perform add or subtract the given amount of time to the given cal_fi (calendar field).

  add()方法用于对指定的cal_fi(日历字段)执行相加或相减的时间量。

• add() method is a non-static method, it is accessible with the class object and if we try to access the method with the class name then we will get an error.

  add()方法是一种非静态方法，可通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• add() method does not throw an exception at the time of adding or subtracting the given time to a given calendar field.

  在给定日历字段添加或减去给定时间时， add()方法不会引发异常。

Syntax:

句法：

    public abstract void add(int cal_fi, int  time);

Parameter(s):

参数：

• int cal_fi – represents the calendar field.

  int cal_fi –代表日历字段。

• int amt – represents the amount of time to be added or subtracted to the calendar field.

  int amt –表示要添加或减去到日历字段的时间。

Return value:

返回值：

The return type of the method is void, it returns nothing.

该方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java Program to demonstrate the example of
// void add(int cal_fi,int amt) method of Calendar
import java.util.*;
public class AddOfCalendar {public static void main(String[] args) {// Instantiating a Calendar object
Calendar ca = Calendar.getInstance();
// Display current calendar
System.out.println("ca.getTime(): " + ca.getTime());
// By using add() method is to substract 2 years
// to the current calendar
ca.add(Calendar.YEAR, -2);
// Display Update Calendar
System.out.println("cal.add(Calendar.YEAR, -2): " + ca.getTime());
// By using add() method is to add 2 months
// to the current calendar
ca.add(Calendar.MONTH, 2);
// Display Update Calendar
System.out.println("cal.add(Calendar.MONTH, 2): " + ca.getTime());
// By using add() method is to substract 2 days
// to the current calendar
ca.add(Calendar.DATE, -2);
// Display Update Calendar
System.out.println("cal.add(Calendar.DATE, -2): " + ca.getTime());
}
}

Output

输出量

ca.getTime(): Thu Jan 23 11:06:12 GMT 2020
cal.add(Calendar.YEAR, -2): Tue Jan 23 11:06:12 GMT 2018
cal.add(Calendar.MONTH, 2): Fri Mar 23 11:06:12 GMT 2018
cal.add(Calendar.DATE, -2): Wed Mar 21 11:06:12 GMT 2018

翻译自: https://www.includehelp.com/java/calendar-add-method-with-example.aspx