日歷類的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()方法用于對指定的cal_fi(日歷字段)執行相加或相減的時間量。
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()方法是一種非靜態方法，可通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。
add() method does not throw an exception at the time of adding or subtracting the given time to a given calendar field.
在給定日歷字段添加或減去給定時間時， add()方法不會引發異常。
Syntax:
句法：
public abstract void add(int cal_fi, int time);
Parameter(s):
參數：
int cal_fi – represents the calendar field.
int cal_fi –代表日歷字段。
int amt – represents the amount of time to be added or subtracted to the calendar field.
int amt –表示要添加或減去到日歷字段的時間。
Return value:
返回值：
The return type of the method is void, it returns nothing.
該方法的返回類型為void ，不返回任何內容。
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
輸出量
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
翻譯自: https://www.includehelp.com/java/calendar-add-method-with-example.aspx
