Java Calendar clear()用法及代码示例

Calendar类中的clear()方法用于设置所有日历字段值和此Calendar的时间值(未定义)。
注意：日历类的实现可以将默认字段值用于日期和时间计算。

用法:

public final void clear()

参数：该方法不带任何参数。

返回值：该方法不返回任何值。

以下示例程序旨在说明Calendar类的clear()方法的用法：
例：

// 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 values 
        // of the calendar 
        calndr.clear(); 
  
        // Displaying the final result 
        System.out.println("After clear method: "
                           + calndr.getTime()); 
    } 
}

输出：

Current Date&Time: Tue Feb 12 13:01:42 UTC 2019
After clear method: Thu Jan 01 00:00:00 UTC 1970

示例2:

// Java Code to illustrate clone() Method 
  
import java.util.*; 
  
public class CalendarClassDemo { 
    public static void main(String args[]) 
    { 
        // Creating a calendar object 
        Calendar calndr1 = new GregorianCalendar(2018, 12, 2); 
  
        // Displaying current calendar 
        System.out.println("Original calendar: "
                           + calndr1.getTime()); 
  
        // Clear method for undefining the values 
        // of the calendar 
        calndr1.clear(); 
  
        // Displaying the final result 
        System.out.println("After clear method: "
                           + calndr1.getTime()); 
    } 
}

输出：

Original calendar: Wed Jan 02 00:00:00 UTC 2019
After clear method: Thu Jan 01 00:00:00 UTC 1970

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

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注：本文由纯净天空筛选整理自Chinmoy Lenka大神的英文原创作品 Calendar clear() Method in Java with Examples。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。