Java中的日历完成（）方法与示例

Calendar 类中的complete()方法用于填充日历字段的任何未设置字段。它遵循以下完成过程：

1. 首先，如果尚未计算时间值，则调用 computeTime() 方法从日历字段值中计算时间值。
2. 其次，要计算所有日历字段值，使用了 computeFields() 方法。

句法：

protected void complete()

参数：该方法不带任何参数。

返回值：该方法不返回任何值。

下面的程序说明了 Calendar 类的 complete() 方法的工作原理：
示例 1：

// Java Code to illustrate
// complete() 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
        // complete()
        calndr.set(GregorianCalendar.YEAR, 2008);
        calndr.complete();
  
        // Displaying the current date
        System.out.println("The new"
                           + " date is: " + calndr.getTime());
    }
}

输出：

The Current date is: Wed Feb 13 15:39:33 UTC 2019
The new date is: Tue Jan 01 00:00:00 UTC 2008

示例 2：

// Java Code to illustrate
// complete() 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
        // complete()
        calndr.set(GregorianCalendar.YEAR, 1996);
        calndr.complete();
  
        // Displaying the current date
        System.out.println("The new"
                           + " date is: " + calndr.getTime());
    }
}

输出：

The Current date is: Wed Feb 13 15:39:36 UTC 2019
The new date is: Mon Jan 01 00:00:00 UTC 1996

参考： https: Java/util/Calendar.html#complete()