日歷類的compareTo()方法 (Calendar 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 two Calendar objects or in other words, we can say this method is used to compare the time of this Calendar object and the given Calendar object.

  compareTo()方法用于比較兩個Calendar對象，換句話說，可以說該方法用于比較此Calendar對象和給定Calendar對象的時間。

• compareTo() method is a non-static method, it is accessible with the class object 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，可通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

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

  比較兩個Calendar對象時， compareTo()方法可能會引發異常。

  • NullPointerException: This exception may throw when the given parameter is null exists.NullPointerException ：當給定參數為null時，可能引發此異常。
  • IllegalArgumentException: This exception may throw when the time of the given Calendar object is illegal.IllegalArgumentException ：如果給定Calendar對象的時間非法，則可能引發此異常。

Syntax:

句法：

public int compareTo(Calendar obj2);

Parameter(s):

參數：

• Calendar obj – represents the Calendar object to be compared with this Calendar object.

  Calendar obj –表示要與此日歷對象進行比較的Calendar對象。

Return value:

返回值：

The return type of this method is int, it returns the following values based on the below given cases,

此方法的返回類型為int ，它基于以下給定情況返回以下值：

• It returns 0 if this Calendar time value is the same as the given Calendar time.

  如果此日歷時間值與給定的日歷時間相同，則返回0 。

• It returns the value < 0 if the time denoted by this Calendar is before the time denoted by the given Calendar parameter.

  如果此Calendar表示的時間早于給定Calendar參數表示的時間，它將返回值<0 。

• It returns the value > 0 if this Calendar time is after the time denoted by the given Calendar parameter.

  如果此日歷時間晚于給定Calendar參數指示的時間，它將返回值> 0 。

Example:

例：

// Java Program to demonstrate the example of // int compareTo(Object) method of Calendarimport java.util.*;public class CompareOfCalendar {public static void main(String[] args) {// Instantiating two Calendar objectCalendar ca1 = Calendar.getInstance();Calendar ca2 = Calendar.getInstance();// By using add() method to add the 10 years// in ca2 to the current ca1ca2.add(Calendar.YEAR, 10);// Display ca1 and ca2System.out.println("ca1: " + ca1.getTime());System.out.println("ca2: " + ca2.getTime());// By using compareTo(Object) method is to// compare two calendar ca1 and ca2int comp = ca1.compareTo(ca2);// Display compared resultSystem.out.println("ca1.compareTo(ca2): " + comp);} }

Output

輸出量

ca1: Thu Jan 23 11:51:26 GMT 2020 ca2: Wed Jan 23 11:51:26 GMT 2030 ca1.compareTo(ca2): -1

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

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