Java Date compareTo（）方法与示例

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

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

  compareTo()方法在java.util包中可用。

• compareTo() method is used to compare this date and the given date (d2) or in other words, we can this method compare two Date objects.

  compareTo()方法用于比较此日期和给定日期(d2)，换句话说，我们可以使用此方法比较两个Date对象。

• compareTo() 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.

  compareTo()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。

• compareTo() method may throw an exception at the time of comparing two Date objects.

  比较两个Date对象时， compareTo()方法可能会引发异常。

  NullPointerException: This exception may throw when the given parameter (d2) is null exists.

  NullPointerException ：如果给定参数(d2)为null，则可能引发此异常。

Syntax:

句法：

public int compareTo(Date d2);

Parameter(s):

参数：

• Date d2 – represents another date to be compared with.

  日期d2 –表示要比较的另一个日期。

Return value:

返回值：

The return type of this method is int, it returns any one of the given values.

此方法的返回类型为int ，它返回给定值中的任何一个。

• It returns 0, when d1 = d2.

  当d1 = d2时，它返回0。

• It returns negative value, when d1 < d2.

  当d1 <d2时，它返回负值。

• It returns positive value, when d1 > d2.

  当d1> d2时，它返回正值。

Example:

例：

// Java program to demonstrate the example
// of int compareTo() method of Date
import java.util.*;
public class CompareToDate {
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 compareTo() method is to compare
// this_date and the given_date
int result = this_date.compareTo(given_date);
// Display result
System.out.println("this_date.compareTo(given_date): " + result);
}
}

Output

输出量

this_date.compareTo(given_date): 1

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