LocalDate類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()方法用于將此LocalDate對象與給定對象進行比較。

• 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異常。

Syntax:

句法：

public int compareTo(ChronoLocalDate l_date);

Parameter(s):

參數：

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

  ChronoLocalDate l_date –表示要與此LocalDate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 LocalDate) < (ChronoLocalDate l_date), it returns -ve.

  當(this LocalDate)<(ChronoLocalDate l_date)時，它返回-ve。

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

  當(this LocalDate)>(ChronoLocalDate l_date)時，它返回+ ve。

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

  當(this LocalDate)==(ChronoLocalDate l_date)時，它返回0。

Example:

例：

// Java program to demonstrate the example // of int compareTo(ChronoLocalDate l_date) // method of LocalDateimport java.time.*;public class CompareToOfLocalDate {public static void main(String args[]) {// Instantiates two LocalDateLocalDate l_da1 = LocalDate.parse("2007-04-04");LocalDate l_da2 = LocalDate.now();// Display l_da1,l_da2System.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 returnedint compare = l_da1.compareTo(l_da2);// Display compareSystem.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 returnedcompare = l_da2.compareTo(l_da1);// Display compareSystem.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_da1compare = l_da1.compareTo(l_da1);// Display compareSystem.out.println("l_da1.compareTo(l_da1): " + compare);} }

Output

輸出量

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

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

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