当前位置: 首页>>代码示例 >>用法及示例精选 >>正文

Java GregorianCalendar add()用法及代码示例


java.util.GregorianCalendar.add(int calendarfield，int time)是Java中GregorianCalendar类的内置方法。该函数接受日历字段和要添加到该特定日历字段的时间量作为参数。根据日历规则，该方法根据其符号在指定字段中添加或减去指定的时间量。

用法:

public void add(int calendarfield, int time)

参数：该函数接受两个强制性参数，如下所述：


  • calendarfield:要修改的日历字段。
  • time :要添加的时间量。

返回值：此方法没有返回值。

异常：如果calendarfield的值为ZONE_OFFSET，DST_OFFSET或未知，或者任何日历字段的值超出范围，则此方法将引发IllegalArgumentException。

例子：

Current Date and Time : Mon Jul 23 12:46:05 UTC 2018

Input : calendarfied = GregorianCalendar.YEAR, time = 2
Output : Thu Jul 23 12:46:05 UTC 2020

Input : calendarfied = GregorianCalendar.MONTH, time = 16
Output : Sat Nov 23 12:46:45 UTC 2019

以下程序说明了Java中java.util.GregorianCalendar.add()方法的使用：
程序1:

// Java Program to demonstrate add() method 
  
import java.io.*; 
import java.util.*; 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // Creating a new calendar 
        GregorianCalendar newcalendar = (GregorianCalendar) 
                           GregorianCalendar.getInstance(); 
  
        // Display the current date and time 
        System.out.println(" Current Date and Time : "
                           + newcalendar.getTime()); 
        // Adding two months to the current date 
        newcalendar.add((GregorianCalendar.MONTH), 2); 
  
        // Display the modified date and time 
        System.out.println(" Modified Date and Time : "
                           + newcalendar.getTime()); 
    } 
}
输出： 
Current Date and Time : Fri Aug 03 11:48:38 UTC 2018
 Modified Date and Time : Wed Oct 03 11:48:38 UTC 2018

程序2:

// Java Program to demonstrate add() method 
import java.io.*; 
import java.util.*; 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // Creating a new calendar 
        GregorianCalendar newcalendar = (GregorianCalendar) 
                           GregorianCalendar.getInstance(); 
  
        // Display the current date and time 
        System.out.println(" Current Date and Time : "
                           + newcalendar.getTime()); 
        // Adding twenty years to the current date 
        newcalendar.add((GregorianCalendar.YEAR), 20); 
        // Display the modified date and time 
        System.out.println(" Modified Date and Time : "
                           + newcalendar.getTime()); 
    } 
}
输出： 
Current Date and Time : Fri Aug 03 11:48:40 UTC 2018
 Modified Date and Time : Tue Aug 03 11:48:40 UTC 2038

程序3:

// Java Program to illustrate 
// GregorianCalendar.add() 
// function  
  
import java.io.*; 
import java.util.*; 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // Creating a new calendar 
        GregorianCalendar newcalendar = (GregorianCalendar) 
                           GregorianCalendar.getInstance(); 
  
        // Display the current date and time 
        System.out.println(" Current Date and Time : "
                           + newcalendar.getTime()); 
        // Deducting 16 months to the current date 
        newcalendar.add((GregorianCalendar.MONTH), -16); 
        // Display the modified date and time 
        System.out.println(" Modified Date and Time : "
                           + newcalendar.getTime()); 
  
        // Deducting twelve years to the current date 
        newcalendar.add((GregorianCalendar.MONTH), -12); 
        // Display the modified date and time 
        System.out.println(" Modified Date and Time : "
                           + newcalendar.getTime()); 
    } 
}
输出： 
Current Date and Time : Fri Aug 03 11:48:43 UTC 2018
 Modified Date and Time : Mon Apr 03 11:48:43 UTC 2017
 Modified Date and Time : Sun Apr 03 11:48:43 UTC 2016

参考： https://docs.oracle.com/javase/7/docs/api/java/util/GregorianCalendar.html#add()



相关用法


注：本文由纯净天空筛选整理自RICHIK BHATTACHARJEE大神的英文原创作品 GregorianCalendar add() Method in Java。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。