即时类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()方法用于将此Instant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 may throw an exception at the time of comparing.

  compareTo()方法在比较时可能会引发异常。

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

  NullPointerException ：当给定参数为null时，可能引发此异常。

Syntax:

句法：

    public int compareTo(Instant ins);

Parameter(s):

参数：

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

  Instant ins –表示要与此Instant进行比较的对象。

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，

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

  如果(此Instant)<(Instant ins)，则返回-1。

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

  如果(此Instant)>(Instant ins)，则返回1。

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

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

Example:

例：

// Java program to demonstrate the example 
// of int compareTo() method of Instant
import java.time.*;
public class CompareOfInstant {
public static void main(String args[]) {
// Instantiates two Instant
Instant ins1 = Instant.parse("2006-04-03T05:10:15.00Z");
Instant ins2 = Instant.parse("2007-06-05T10:20:30.00Z");
// Display ins1,ins2
System.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 < ins2
int compare = ins1.compareTo(ins2);
// Display compare
System.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 == ins1
compare = ins1.compareTo(ins1);
// Display compare
System.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 > ins2
compare = ins2.compareTo(ins1);
// Display compare
System.out.println("ins2.compareTo(ins1): " + compare);
}
}

Output

输出量

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

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