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 Calendarimport java.util.*;public class AddOfCalendar {public static void main(String[] args) {// Instantiating a Calendar objectCalendar ca = Calendar.getInstance();// Display current calendarSystem.out.println("ca.getTime(): " + ca.getTime());// By using add() method is to substract 2 years// to the current calendarca.add(Calendar.YEAR, -2);// Display Update CalendarSystem.out.println("cal.add(Calendar.YEAR, -2): " + ca.getTime());// By using add() method is to add 2 months// to the current calendarca.add(Calendar.MONTH, 2);// Display Update CalendarSystem.out.println("cal.add(Calendar.MONTH, 2): " + ca.getTime());// By using add() method is to substract 2 days// to the current calendarca.add(Calendar.DATE, -2);// Display Update CalendarSystem.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

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