Java 中的 Calendar computeFields()方法，带示例

原文:https://www . geesforgeks . org/calendar-computefields-method-in-Java-with-examples/

Calendar 类中的 computeFields() 方法用于将当前毫秒时间值 time 转换为字段[]中提到的日历字段值的转换操作。

注意:这允许将为日历对象设置的新时间与日历字段值同步。

语法:

protected abstract void computeFields()

参数:该方法不取任何参数。

返回值:该方法不返回值。

下面的程序说明了 Calendar 类的 computeFields()方法的工作: 例 1:

// Java Code to illustrate
// computeFields() Method

import java.util.*;

public class CalendarClassDemo
    extends GregorianCalendar {
    public static void main(String args[])
    {
        // Creating calendar object
        CalendarClassDemo calndr = new CalendarClassDemo();

        // Displaying the current date
        System.out.println("The Current "
                           + "date is: " + calndr.getTime());

        // Clearing the calendar
        calndr.clear();

        // Set a new year and call
        // computeFields()
        calndr.set(GregorianCalendar.YEAR, 2016);
        calndr.computeFields();

        // Displaying the current date
        System.out.println("The recent"
                           + " date is: " + calndr.getTime());
    }
}

Output:

The Current date is: Wed Feb 13 16:15:15 UTC 2019
The recent date is: Wed Feb 13 16:15:15 UTC 2019

例 2:

// Java Code to illustrate
// computeFields() Method

import java.util.*;

public class CalendarClassDemo
    extends GregorianCalendar {
    public static void main(String args[])
    {
        // Creating calendar object
        CalendarClassDemo calndr = new CalendarClassDemo();

        // Displaying the current date
        System.out.println("The Current "
                           + "date is: " + calndr.getTime());

        // Clearing the calendar
        calndr.clear();

        // Set a new year and call
        // computeFields()
        calndr.set(GregorianCalendar.YEAR, 2000);
        calndr.computeFields();

        // Displaying the current date
        System.out.println("The recent"
                           + " date is: " + calndr.getTime());
    }
}

Output:

The Current date is: Wed Feb 13 16:15:18 UTC 2019
The recent date is: Wed Feb 13 16:15:18 UTC 2019

参考:https://docs . Oracle . com/javase/7/docs/API/Java/util/calendar . html # computeFields()

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