date的before方法_Java Date before（）方法与示例

date的before方法

日期类before()方法 (Date Class before() method)

• before() method is available in java.util package.

  before()方法在java.util包中可用。

• before() method is used to check whether this date is before the given date (d) or not.

  before()方法用于检查此日期是否早于给定日期(d)。

• before() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  before()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• before() method may throw an exception at the time of the checking date.

  在检查日期之时， before()方法可能会引发异常。

  NullPointerException: This exception may throw when the given parameter (d) is null exists.

  NullPointerException：如果给定参数(d)为null，则可能引发此异常。

Syntax:

句法：

    public boolean before(Date d);

Parameter(s):

参数：

• Date d – represents the Date object to be tested.

  Date d –表示要测试的Date对象。

Return value:

返回值：

The return type of this method is boolean, it returns true when this date is before the given Date (d) otherwise it returns false.

此方法的返回类型为boolean ，如果此日期早于给定的Date(d)，则返回true，否则返回false。

Example:

例：

// Java program to demonstrate the example 
// of boolean before() method of Date 

import java.util.*;

public class BeforeDate {
    public static void main(String[] args) {
        // create two Date object with two dates
        Date this_date = new Date(2016, 8, 20);
        Date given_date = new Date(2010, 11, 30);

        // By using before() method is to check
        // whether this date (this_date) is before the
        // given date (given_date) or not
        boolean status = this_date.before(given_date);

        // Display status
        System.out.println("this_date.before(given_date): " + status);
    }
}

Output

输出量

this_date.before(given_date): false

翻译自: https://www.includehelp.com/java/date-before-method-with-example.aspx

date的before方法