Java 日历 complete()方法及实例

Calendar类中的 complete() 方法用于填充日历字段中任何未设置的字段。它遵循以下的完成过程。

1. 首先，如果时间值没有被计算出来，则调用computeTime()方法从日历字段值中计算出来。
2. 其次，为了计算所有的日历字段值，会使用 computeFields() 方法。

语法

protected void complete()

参数： 该方法不接受任何参数。

返回值： 该方法不返回任何值。

下面的程序说明了日历类的complete()方法的工作原理：

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

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

**参考资料: **https://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html#complete()