GregorianCalendar類computeFields()方法 (GregorianCalendar Class computeFields() method)

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

  在java.util包中提供了validateFields()方法 。

• computeFields() method is used to compute the calendar fields and as we know that to compute the time again and then calendar fields and then call complete() method.

  如我們所知， computeFields()方法用于計算日歷字段，然后再計算時間，然后再計算日歷字段，然后調用complete()方法。

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

  computeFields()方法是一種非靜態方法，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。

• computeFields() method does not throw an exception at the time of computing fields.

  在計算字段時， computeFields()方法不會引發異常。

Syntax:

句法：

    protected void computeFields();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

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 computeFields() method of 
// GregorianCalendar 
import java.util.*;
public class ComputeFieldOfGregorianCalendar extends GregorianCalendar {
public static void main(String[] args) {
// Instantiating a ComputeFieldOfGregorianCalendar object
ComputeFieldOfGregorianCalendar ca = new ComputeFieldOfGregorianCalendar();
// Display current ComputeFieldOfGregorianCalendar
System.out.println("ca: " + ca.getTime());
// By using clear(int fi) method to set the
// field unset
ca.clear(GregorianCalendar.MONTH);
// Display calendar
System.out.println("ca.clear(GregorianCalendar.MONTH): " + ca.getTime());
// By using set() method is to set a month 
//and invoke computeFields()
ca.set(GregorianCalendar.MONTH, 6);
ca.computeFields();
// Display calendar
System.out.println("ca.set(GregorianCalendar.MONTH,6): " + ca.getTime());
}
}

Output

輸出量

ca: Sat Feb 15 07:17:20 GMT 2020
ca.clear(GregorianCalendar.MONTH): Wed Jan 15 07:17:20 GMT 2020
ca.set(GregorianCalendar.MONTH,6): Wed Jan 15 07:17:20 GMT 2020

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