GregorianCalendar类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.

  如我们所知， computeFields()方法用于计算日历字段，然后再计算时间，然后再计算日历字段，然后调用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()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

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

  在计算字段时， computeFields()方法不会引发异常。

Syntax:

句法：

protected void computeFields();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

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

此方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example // of void 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

输出量

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

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