Java即时类| 带示例的compareTo()方法
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
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