Java Calendar clear(int cal_field)用法及代碼示例

Calendar類中的clear(int cal_field)方法用於設置給定的日曆字段值和此Calendar的時間值(未定義)。注意：日曆類的實現可能使用默認字段值進行日期和時間計算。

用法:

public final void clear(int cal_field)

參數：該方法采用整數類型的一個參數cal_field，表示要使其不確定的字段值。

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clear()方法的用法：
範例1：

// Java Code to illustrate clear() 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&Time:"
                           + calndr.getTime()); 
  
        // Clear method for undefining the month 
        // of the calendar 
        calndr.clear(Calendar.MONTH); 
  
        // Displaying the final result 
        System.out.println("After clear method:"
                           + calndr.getTime()); 
    } 
}

輸出：

Current Date&Time:Wed Mar 27 09:03:26 UTC 2019
After clear method:Sun Jan 27 09:03:26 UTC 2019

範例2：

// Java Code to illustrate clear() 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&Time:"
                           + calndr.getTime()); 
  
        // Clear method for undefining the year 
        // of the calendar 
        calndr.clear(Calendar.YEAR); 
  
        // Displaying the final result 
        System.out.println("After clear method:"
                           + calndr.getTime()); 
    } 
}

輸出：

Current Date&Time:Wed Mar 27 09:03:32 UTC 2019
After clear method:Fri Mar 27 09:03:32 UTC 1970

參考：https://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html#clear(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 clear(int cal_field) 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。