How to Generate an unique ID in Java

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Example

UUID is the fastest and easiest way to generate unique ID in Java. 


import java.util.UUID;  
public class UniqueIDTest {  
 public static void main(String[] args) {  
  UUID uniqueKey = UUID.randomUUID();   
  System.out.println (uniqueKey);  
}  
}

Result


0a6a3de7-b974-42d0-af9e-9c23473b09b9

mkyong

Founder of Mkyong.com, passionate Java and open-source technologies. If you enjoy my tutorials, consider making a donation to these charities.

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Aashwinee
8 years ago

Hi, what if we want to generate unique ID with fixed length then how the code looks like.

18
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Amol
13 years ago

I am trying to generate a unique 10 digit alpha numeric number, any way to do that in a distributed system

11
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varsha janghu
7 years ago

good tutorials

0
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Erik Boisen
8 years ago

Is there any way to get a unique id that will be the same every time for a particular machine regardless of OS?

0
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André Verwijs
9 years ago

is this version 1 or version 4 uuid..??

0
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lucky_muzhik
11 years ago

Thank you. in the bull’s eye

0
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sam009
12 years ago

Nice piece of code but not every time it is unique….

0
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sudheer
12 years ago

its good,thanks

0
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Anil
14 years ago

Its Good, simple way to get UUID

0
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Karthikeyan
16 years ago

Its nice. Could have explored the options supported in UUID and the limitations identified to explore more.

0
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