Java 日历 clear()方法及实例

Calendar类中的 clear() 方法用于设置所有的日历字段值和这个Calendar的时间值。

注意： 日历类的实现可以使用默认字段值来计算日期和时间。

语法

public final void clear()

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clear()方法的工作：

例子

// 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 2019After clear method: Thu Jan 01 00:00:00 UTC 1970

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 2019After clear method: Thu Jan 01 00:00:00 UTC 1970

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