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Java UUID compareTo() Method with Example

UUID Class compareTo() method: Here, we are going to learn about the compareTo() method of UUID Class with its syntax and example.
Submitted by Preeti Jain, on February 21, 2020

UUID Class compareTo() method

• compareTo() method is available in java.util package.
• compareTo() method is used to compare two UUID objects or in other words, it is used to compare this UUID with the given object (ob).
• 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() method does not throw an exception at the time of comparing two objects.

Syntax:

    public int compareTo(UUID ob);

Parameter(s):

• UUID ob – represents the UUID object to be compared with this UUID.

Return value:

The return type of the method is int, it returns any one of the given three values [0,1 and -1],

• When (This UUID) < (UUID ob), it returns -1.
• When (This UUID) == (UUID ob), it returns 0.
• When (This UUID) > (UUID ob), it returns 1.

Example:

// Java program to demonstrate the example 
// of int compareTo(UUID ob) method of UUID 

import java.util.*;

public class CompareToOfUUID {
    public static void main(String[] args) {
        // Instantiate UUID    
        UUID uuid1 = UUID.fromString("46400000-8cc0-11bd-b43e-10d46e4ef14d");
        UUID uuid2 = UUID.fromString("56500000-8cd0-10bd-b65e-10d46e4ef14d");

        // By using compareTo() method is
        // to compare this object with the given object

        int result = uuid1.compareTo(uuid2);
        System.out.println("uuid1.compareTo(uuid2): " + result);
    }
}

Output

uuid1.compareTo(uuid2): -1