Generate long fixed size random String

Question

I want to generate unique 25 characters and numbers long string using the following code,

public static String generateString() {
   String uuid = UUID.randomUUID().toString();
   return uuid;
}

How I can set the size of the generated String and remove the - symbols?

UUID cannot come with a fixed size – Basil Battikhi Jul 29 '18 at 14:29 — Basil Battikhi, Jul 29 '18 at 14:29

score 5 · Answer 1 · answered Jul 29 '18 at 14:29

UUID is of fixed size, if you just want to get rid of - use replace as mentioned above or else you have to substring to get the desired length. Also, keep in mind UUID has defined length of 16-byte.

Reference: java.util.UUID.randomUUID().toString() length

Roshana Pitigala · Answer 2 · 2018-07-29T14:28:36.087

3

Use replace()

uuid = uuid.replace("-", "");

edited Jul 29 '18 at 14:28

answered Jul 29 '18 at 14:24

Roshana Pitigala

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Thanks, but how I can set the fixed size? – Peter Penzov Jul 29 '18 at 14:24
what do you mean by the fixed size? – Roshana Pitigala Jul 29 '18 at 14:25
For example I want always to generate 25 characters long string. – Peter Penzov Jul 29 '18 at 14:25
Strings are Immutable – Basil Battikhi Jul 29 '18 at 14:27
@JBNizet No, it will compile fine but strings are immutable – Basil Battikhi Jul 29 '18 at 14:28
@BasilBattikhi now it will. At the time I commented, when the code was different, it wouldn't. – JB Nizet Jul 29 '18 at 14:31
@JBNizet yeah. that was my mistake. Apologies... – Roshana Pitigala Jul 29 '18 at 14:32
@JBNizet He did nothing else reassigning uuid the code is stil as it was – Basil Battikhi Jul 29 '18 at 14:32
@BasilBattikhi actually I did `char -> String`. – Roshana Pitigala Jul 29 '18 at 14:33
@RoshanaPitigala yes i just saw the edit history, You cant have empty single qout – Basil Battikhi Jul 29 '18 at 14:34
@PeterPenzov the size is fixed. You'll always get 32 characters long String value after replacing `-`. – Roshana Pitigala Jul 29 '18 at 14:37

Generate long fixed size random String

2 Answers2