Java 中日历清除(int cal_field)方法，示例

原文:https://www . geesforgeks . org/calendar-clearint-cal _ field-method-in-Java-with-examples/

日历类中的clear(intcal _ field)方法用于设置给定的日历字段值，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(int *cal_field*)

参数:该方法取一个整数类型的参数 cal_field ，指的是待定义的字段值。

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: 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());
    }
}

Output:

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

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());
    }
}

Output:

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

参考:https://docs . Oracle . com/javase/7/docs/API/Java/util/calendar . html # clear(int)

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