LocalDateTime類compareTo()方法 (LocalDateTime 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 date-time object to the given date-time object.

  compareTo()方法用于將此日期時間對象與給定的日期時間對象進行比較。

• 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()方法是一種非靜態(tài)方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• compareTo() method does not throw an exception at the time of comparing.

  compareTo()方法在比較時不會引發(fā)異常。

Syntax:

句法：

public int compareTo(ChronoLocalDateTime l_datetime) ;

Parameter(s):

參數(shù)：

• ChronoLocalDateTime l_datetime – represents the object to be compared to this LocalDateTime.

  ChronoLocalDateTime l_datetime –表示要與此LocalDateTime比較的對象。

Return value:

返回值：

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

此方法的返回類型為int ，它可以返回任何給定值。

• When (this LocalDateTime) < (ChronoLocalDateTime l_datetime), it returns -1.

  當(this LocalDateTime)<(ChronoLocalDateTime l_datetime)時，它返回-1。

• When (this LocalDateTime) > (ChronoLocalDateTime l_datetime), it returns 1.

  當(this LocalDateTime)>(ChronoLocalDateTime l_datetime)時，它返回1。

Example:

例：

// Java program to demonstrate the example // of int compareTo(ChronoLocalDateTime l_datetime) // method of LocalDateTimeimport java.time.*;public class CompareToOfLocalDateTime {public static void main(String args[]) {// Instantiates two LocalDateTimeLocalDateTime da_ti1 = LocalDateTime.parse("2005-10-05T10:10:10");LocalDateTime da_ti2 = LocalDateTime.now();// Display da_ti1, da_ti2System.out.println("LocalDateTime da_ti1 and da_ti2: ");System.out.println("da_ti1: " + da_ti1);System.out.println("da_ti2: " + da_ti2);System.out.println();// Here, this method compares two date-time// objects i.e. here it returns the // difference of first non-matching field// in both the objects like first non-match// field is year da_ti1 = 2005 and da_ti2// = 2020 so the value (2005-2020 = -15)// -15 will be returnedint compare = da_ti1.compareTo(da_ti2);// Display compareSystem.out.println("da_ti1.compareTo(da_ti2): " + compare);// Here, this method compares two date-time// objects i.e. here it returns the // difference of first non-matching field// in both the objects like first non-match// field is year da_ti2 = 2020 and da_ti2// = 2005 so the value (2020 - 2005 = 15)// 15 will be returnedcompare = da_ti2.compareTo(da_ti1);// Display compareSystem.out.println("da_ti2.compareTo(da_ti1): " + compare);// Here, this method compares two date-time// objects i.e. here it returns 0 because// date-time are same in both the compared// objectscompare = da_ti1.compareTo(da_ti1);// Display compareSystem.out.println("da_ti1.compareTo(da_ti1): " + compare);} }

Output

輸出量

LocalDateTime da_ti1 and da_ti2: da_ti1: 2005-10-05T10:10:10 da_ti2: 2020-06-04T08:35:27.674928da_ti1.compareTo(da_ti2): -15 da_ti2.compareTo(da_ti1): 15 da_ti1.compareTo(da_ti1): 0

翻譯自: https://www.includehelp.com/java/localdatetime-compareto-method-with-example.aspx

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