即時類compareTo()方法 (Instant 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 Instant object to the given object.

  compareTo()方法用于將此Instant對象與給定對象進(jìn)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 may throw an exception at the time of comparing.

  compareTo()方法在比較時可能會引發(fā)異常。

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

  NullPointerException ：當(dāng)給定參數(shù)為null時，可能引發(fā)此異常。

Syntax:

句法：

public int compareTo(Instant ins);

Parameter(s):

參數(shù)：

• Instant ins – represents the object to be compared to this Instant.

  Instant ins –表示要與此Instant進(jìn)行比較的對象。

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，

• If (this Instant) < (Instant ins), it returns -1.

  如果(此Instant)<(Instant ins)，則返回-1。

• If (this Instant) > (Instant ins), it returns 1.

  如果(此Instant)>(Instant ins)，則返回1。

• If (this Instant) == (Instant ins), it returns 0.

  如果(this Instant)==(Instant ins)，則返回0。

Example:

例：

// Java program to demonstrate the example // of int compareTo() method of Instantimport java.time.*; public class CompareOfInstant {public static void main(String args[]) {// Instantiates two InstantInstant ins1 = Instant.parse("2006-04-03T05:10:15.00Z");Instant ins2 = Instant.parse("2007-06-05T10:20:30.00Z");// Display ins1,ins2System.out.println("Instant ins1 and ins2: ");System.out.println("ins1: " + ins1);System.out.println("ins2: " + ins2);System.out.println();// Here, this method compares this Instant// (ins1) to the given Instant(ins2) i.e.// here it returns -1 because ins1 < ins2int compare = ins1.compareTo(ins2);// Display compareSystem.out.println("ins1.compareTo(ins2): " + compare);// Here, this method compares this Instant// (ins1) to the given Instant(ins1) i.e.// here it returns 0 because ins1 == ins1compare = ins1.compareTo(ins1);// Display compareSystem.out.println("ins1.compareTo(ins1): " + compare);// Here, this method compares this Instant// (ins2) to the given Instant(ins1) i.e.// here it returns 1 because ins1 > ins2compare = ins2.compareTo(ins1);// Display compareSystem.out.println("ins2.compareTo(ins1): " + compare);} }

Output

輸出量

Instant ins1 and ins2: ins1: 2006-04-03T05:10:15Z ins2: 2007-06-05T10:20:30Zins1.compareTo(ins2): -1 ins1.compareTo(ins1): 0 ins2.compareTo(ins1): 1

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

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