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Java Calendar add()用法及代碼示例


Calendar類的add(int字段，int amt)方法用於根據日曆的規則從給定的日曆字段(int字段)中添加或減去特定時間(int amt)。

用法:

public abstract void add(int field, int amt)

參數：該方法有兩個參數：


  • field：這是整數類型，是指要在其上執行操作的日曆字段。
  • amt：這是整數類型，是指需要減去的時間。

返回值：該方法不返回任何值。

以下示例程序旨在說明Calendar類的add()方法的用法：
示例1:

// Java Code to illustrate add() Method 
  
import java.util.Calendar; 
  
public class CalendarClassDemo { 
    public static void main(String args[]) 
    { 
        // Creating a calendar object 
        Calendar calndr 
            = Calendar.getInstance(); 
  
        // Displaying the Current Date 
        System.out.println("Current Date: "
                           + calndr.getTime()); 
  
        // Adding 50 days to the 
        // Current Calendar 
        calndr.add(Calendar.DATE, 50); 
        System.out.println("After 50 days: "
                           + calndr.getTime()); 
  
        // Subtracting 6 months from 
        // the Current calendar 
        calndr.add(Calendar.MONTH, -6); 
        System.out.println("6 months ago it was: "
                           + calndr.getTime()); 
  
        // Subtracting 2 year from 
        // the Current calendar 
        calndr.add(Calendar.YEAR, -2); 
        System.out.println("2 years ago it was: "
                           + calndr.getTime()); 
    } 
}
輸出： 
Current Date: Tue Feb 12 10:54:21 UTC 2019
After 50 days: Wed Apr 03 10:54:21 UTC 2019
6 months ago it was: Wed Oct 03 10:54:21 UTC 2018
2 years ago it was: Mon Oct 03 10:54:21 UTC 2016

示例2:

// Java Code to illustrate add() Method 
  
import java.util.Calendar; 
  
public class CalendarClassDemo { 
    public static void main(String args[]) 
    { 
        // Creating a calendar object 
        Calendar calndr 
            = Calendar.getInstance(); 
  
        // Displaying the Current Date 
        System.out.println("Current Date: "
                           + calndr.getTime()); 
  
        // Adding 30 days to the 
        // Current Calendar 
        calndr.add(Calendar.DATE, 30); 
        System.out.println("After 30 days: "
                           + calndr.getTime()); 
  
        // Subtracting 3 months from 
        // the Current calendar 
        calndr.add(Calendar.MONTH, -3); 
        System.out.println("3 months ago it was: "
                           + calndr.getTime()); 
  
        // Subtracting 10 years from 
        // the Current calendar 
        calndr.add(Calendar.YEAR, -10); 
        System.out.println("10 years ago it was: "
                           + calndr.getTime()); 
    } 
}
輸出： 
Current Date: Tue Feb 12 10:54:24 UTC 2019
After 30 days: Thu Mar 14 10:54:24 UTC 2019
3 months ago it was: Fri Dec 14 10:54:24 UTC 2018
10 years ago it was: Sun Dec 14 10:54:24 UTC 2008

參考： https://docs.oracle.com/javase/9/docs/api/java/util/Calendar.html#add-int-int-



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注：本文由純淨天空篩選整理自Chinmoy Lenka大神的英文原創作品 Calendar add() Method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。