GregorianCalendar類的add()方法 (GregorianCalendar 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 add the given quantity to the specified GregorianCalendar field (fi).

  add()方法用于將給定數量添加到指定的GregorianCalendar字段(fi)。

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

  add()方法是一個非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• add() method may throw an exception at the time of adding the given quantity to the given field (fi).

  在將給定量添加到給定字段(fi)時， add()方法可能會引發異常。

  IllegalArgumentException: This exception may throw when the given field (fi) is not in a range.

  IllegalArgumentException ：如果給定字段(fi)不在范圍內，則可能引發此異常。

Syntax:

句法：

public void add(int fi , int quantity);

Parameter(s):

參數：

• int fi – represents the GregorianCalendar field.

  int fi –表示GregorianCalendar字段。

• int quantity – represents the quantity of time to be added to the given calendar field.

  int數量 –表示要添加到給定日歷字段中的時間量。

Return value:

返回值：

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

此方法的返回類型為void ，不返回任何內容。

Example:

例：

// Java program to demonstrate the example // of void add(int fi , int quantity) method of // GregorianCalendar import java.util.*;public class AddOfGregorianCalendar {public static void main(String[] args) {// Instantiating a GregorianCalendar objectGregorianCalendar g_ca = (GregorianCalendar) GregorianCalendar.getInstance();// Display current GregorianCalendarSystem.out.println("g_ca.getTime() : " + g_ca.getTime());// By using add() method is to substract 3 years// to the current GregorianCalendarg_ca.add(GregorianCalendar.YEAR, -3);// Display Update GregorianCalendarSystem.out.println("g_ca.add(GregorianCalendar.YEAR, -3): " + g_ca.getTime());// By using add() method is to add 5 months// to the current GregorianCalendarg_ca.add(GregorianCalendar.MONTH, 5);// Display Update CalendarSystem.out.println("g_ca.add(GregorianCalendar.MONTH, 3): " + g_ca.getTime());// By using add() method is to substract 2 days// to the current GregorianCalendarg_ca.add(GregorianCalendar.DATE, -2);// Display Update GregorianCalendarSystem.out.println("g_ca.add(GregorianCalendar.DATE, -2): " + g_ca.getTime());} }

Output

輸出量

g_ca.getTime() : Sat Feb 15 06:51:12 GMT 2020 g_ca.add(GregorianCalendar.YEAR, -3): Wed Feb 15 06:51:12 GMT 2017 g_ca.add(GregorianCalendar.MONTH, 3): Sat Jul 15 06:51:12 GMT 2017 g_ca.add(GregorianCalendar.DATE, -2): Thu Jul 13 06:51:12 GMT 2017

翻譯自: https://www.includehelp.com/java/gregoriancalendar-add-method-with-example.aspx

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