Java 中的日历清除()方法，带示例

原文:https://www . geesforgeks . org/calendar-clear-method-in-Java-with-examples/

Calendar 类中的 clear() 方法用于设置所有的日历字段值，该日历的时间值未定义。 注意:日历类的实现可能使用默认字段值进行日期和时间计算。

语法:

public final void clear()

参数:该方法不取任何参数。

返回值:该方法不返回值。

下面的程序说明了 Calendar 类的 clear()方法的工作: 示例:

// 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());
    }
}

Output:

Current Date&Time: Tue Feb 12 13:01:42 UTC 2019
After 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());
    }
}

Output:

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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