Java UUID getMostSignificantBits() Method

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Description

The Java UUID getMostSignificantBits() method is used to return the most significant 64 bits of this UUID's 128 bit value.

Declaration

Following is the declaration for java.util.UUID.getMostSignificantBits() method.

public long getMostSignificantBits()

Parameters

NA

Return Value

The method call returns the most significant 64 bits of this UUID's 128 bit value.

Exception

NA

Getting Most Significant 64 Bits of a UUID generated using Standard Formatted String Example

The following example shows the usage of Java UUID getMostSignificantBits() method to the most significant 64 bits of this UUID's 128 bit value. We've created a UUID object using a given string. Then we've printed the most significant 64 bits associated with the UUID object using getMostSignificantBits() method.

package com.tutorialspoint;

import java.util.UUID;

public class UUIDDemo {
   public static void main(String[] args) {

      // creating UUID      
      UUID x = UUID.fromString("38400000-8cf0-11bd-b23e-10b96e4ef00d");

      // getting most significant 64 bits
      System.out.println("most significant 64 bits: "+x.getMostSignificantBits());    
   }    
}

Output

Let us compile and run the above program, this will produce the following result.

most significant 64 bits: 4053239666997989821

Getting Most Significant 64 Bits of a Random UUID generated Example

The following example shows usage of Java UUID getMostSignificantBits() method to get the most significant 64 bits of this UUID's 128 bit value. We've created a UUID object using randomUUID() method. Then we've printed the most significant 64 bits associated with the UUID object using getMostSignificantBits() method.

package com.tutorialspoint;

import java.util.UUID;

public class UUIDDemo {
   public static void main(String[] args) {

      // creating UUID      
      UUID x = UUID.randomUUID();

      // getting most significant 64 bits
      System.out.println("most significant 64 bits: "+x.getMostSignificantBits());
   }    
}

Output

Let us compile and run the above program, this will produce the following result.

most significant 64 bits: 9185635904161073452

Getting Most Significant 64 Bits of a UUID generated using Bytes Example

The following example shows usage of Java UUID getMostSignificantBits() method to the most significant 64 bits of this UUID's 128 bit value. We've created a UUID object using nameUUIDFromBytes() method. Then we've printed the most significant 64 bits associated with the UUID object using getMostSignificantBits() method.

package com.tutorialspoint;

import java.util.UUID;

public class UUIDDemo {
   public static void main(String[] args) {

      // creating byte array 
      byte[] nbyte = {10,20,30};

      // creating UUID from byte     
      UUID uid = UUID.nameUUIDFromBytes(nbyte);

      // getting most significant 64 bits
      System.out.println("most significant 64 bits: "+uid.getMostSignificantBits());
   }    
}

Output

Let us compile and run the above program, this will produce the following result.

most significant 64 bits: 9172064757165603049