how to generate randomly UNIQUE coupon number which are 6 / 8 digit

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Hi dear experts..im trying to do generate Alphanumeric 6 to 8 digit coupon number which are UNIQUELY and if the coupon number key in is not in the list it will have error message. Can you please guide me ?

Im trying search for similiar result but i saw alot of ppl using

String uniqueID = UUID.randomUUID().toString();

but i have no idea how to use it, i trying to import the same code but it not supported with my current java compilation level(jdk 1.5)

Posted 17-May-15 21:32pm

sigmaxbpo

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Kornfeld Eliyahu Peter 18-May-15 3:47am

Using what? Java or JavaScript?

sigmaxbpo 18-May-15 4:12am

i need it in java..

Kornfeld Eliyahu Peter 18-May-15 4:20am

Remember that Java and JavaScript are two different things altogether!!!

sigmaxbpo 18-May-15 4:26am

ya bro, i understand java and javascript are different code. Sorry i put wrong tag

Kornfeld Eliyahu Peter 18-May-15 4:20am

You may use this: https://commons.apache.org/proper/commons-lang/javadocs/api-2.6/org/apache/commons/lang/RandomStringUtils.html

sigmaxbpo 18-May-15 4:27am

Hi, could you provide more specific solution ? because im not really good in looing at documentation. :(

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Andy Lanng · Answer 1 · 2015-05-17T22:34:00

UUID is a 128 bit code. The idea is that there are so many possible combinations (3.4*10^36) that every random one will be unique. It will not be 6-8 digits.

Coupon codes should not be sequential. This makes them hack-able.

You can use 1 of a couple of methods:

1: Store all previous coupon codes so any new ones generated can exclude them
2: Base the generation of some algorithm which is [date based for example]

I currently use the first option as there will never be so many codes that storing or querying them will be an issue. The code can event just loop while the generated code exists. The delay in the code is milliseconds and coupon codes are only generated once for a campaign.

The second technique works great for generating a high volume of codes. If you're producing a unique code for [printed coupons for example] then this is the technique to use but it is quite complex.