LocalDate类compareTo()方法 (LocalDate Class compareTo() method)

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

  compareTo()方法在java.time包中可用。

• compareTo() method is used to compare this LocalDate object to the given object.

  compareTo()方法用于将此LocalDate对象与给定对象进行比较。

• 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 does not throw an exception at the time of comparing.

  compareTo()方法在比较时不会引发异常。

Syntax:

句法：

    public int compareTo(ChronoLocalDate l_date);

Parameter(s):

参数：

• ChronoLocalDate l_date – represents the object to be compared to this LocalDate.

  ChronoLocalDate l_date –表示要与此LocalDate比较的对象。

Return value:

返回值：

The return type of this method is int, it may return anyone of the given values,

此方法的返回类型为int ，它可以返回任何给定值，

• When (this LocalDate) < (ChronoLocalDate l_date), it returns -ve.

  当(this LocalDate)<(ChronoLocalDate l_date)时，它返回-ve。

• When (this LocalDate) > (ChronoLocalDate l_date), it returns +ve.

  当(this LocalDate)>(ChronoLocalDate l_date)时，它返回+ ve。

• When (this LocalDate) == (ChronoLocalDate l_date), it returns 0.

  当(this LocalDate)==(ChronoLocalDate l_date)时，它返回0。

Example:

例：

// Java program to demonstrate the example
// of int compareTo(ChronoLocalDate l_date)
// method of LocalDate
import java.time.*;
public class CompareToOfLocalDate {public static void main(String args[]) {// Instantiates two LocalDate
LocalDate l_da1 = LocalDate.parse("2007-04-04");
LocalDate l_da2 = LocalDate.now();
// Display l_da1,l_da2
System.out.println("LocalDate l_da1 and l_da2: ");
System.out.println("l_da1: " + l_da1);
System.out.println("l_da2: " + l_da2);
System.out.println();
// Here, this method compares this date object to
// the given date object i.e. it returns -ve
// value because l_da1 = 2007-04-04 and l_da2
// = 2020-05-08 so l_da1 - l_da2 = 2007-2020
// i.e. -13 will be returned
int compare = l_da1.compareTo(l_da2);
// Display compare
System.out.println("l_da1.compareTo(l_da2): " + compare);
// Here, this method compares this date object to
// the given date object i.e. it returns +ve
// value because l_da1 = 2007-04-04 and l_da2
// = 2020-05-08 so l_da2 - l_da1 = 2020-2007
// i.e. 13 will be returned
compare = l_da2.compareTo(l_da1);
// Display compare
System.out.println("l_da2.compareTo(l_da1): " + compare);
// Here, this method compares this date object to
// the given date object i.e. it returns 0
// because l_da1 == l_da1
compare = l_da1.compareTo(l_da1);
// Display compare
System.out.println("l_da1.compareTo(l_da1): " + compare);
}
}

Output

输出量

LocalDate l_da1 and l_da2:
l_da1: 2007-04-04
l_da2: 2020-05-29l_da1.compareTo(l_da2): -13
l_da2.compareTo(l_da1): 13
l_da1.compareTo(l_da1): 0

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