Java UUID node() Method

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Description

The Java UUID node() method is used to get the node value associated with this UUID.

Declaration

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

public long node()

Parameters

NA

Return Value

The method call returns the node value of this UUID.

Exception

UnsupportedOperationException − This exception is thrown if this UUID is not a version 1 UUID.

Getting Node of a UUID generated using Standard Formatted String Example

The following example shows the usage of Java UUID node() method to the node value of this UUID. We've created a UUID object using a given string. Then we've printed the node value of this UUID object using node() 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 node value
      System.out.println("node value: "+x.node());    
   }    
}

Output

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

node value: 18388605661197

Getting Node of a Random UUID generated Example

The following example shows usage of Java UUID node() method to get the node value associated with this UUID which is not supported. We've created a UUID object using randomUUID() method. Then we tried getting the node value associated with the UUID object using node() method. It throws exception which we've captured and printed.

package com.tutorialspoint;

import java.util.UUID;

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

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

      try {
         // getting node value
         System.out.println("node value: "+x.node());
      } catch(Exception e) {
         e.printStackTrace();
      }
   }    
}

Output

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

java.lang.UnsupportedOperationException: Not a time-based UUID
	at java.base/java.util.UUID.node(UUID.java:362)
	at com.tutorialspoint.UUIDDemo.main(UUIDDemo.java:13)

Getting Node of a UUID generated using Bytes Example

The following example shows usage of Java UUID node() method to get the node value associated with this UUID which is not supported. We've created a UUID object using nameUUIDFromBytes() method. Then we tried getting the node value associated with the UUID object using node() method. It throws exception which we've captured and printed.

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);

      try {
         // getting node value
         System.out.println("node value: "+uid.node());
      } catch(Exception e) {
         e.printStackTrace();
      }
   }    
}

Output

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

java.lang.UnsupportedOperationException: Not a time-based UUID
	at java.base/java.util.UUID.node(UUID.java:362)
	at com.tutorialspoint.UUIDDemo.main(UUIDDemo.java:16)