find an algorithm for generating a user"s uid
find an algorithm for generating a user"s uid
use the UUID class that comes with java
package java.util.UUID
String recodId = UUID.randomUUID().toString().replaceAll("-", "");. Using UUID can basically satisfy most scenarios, but because UUID is not orderly, it does not perform very well in scenarios that require ordering. You can learn about the Snowflake algorithm
you can use this package. If you want to go deeper, you can see how he did it.
node-uuid
cat / proc/sys/kernel/random/uuid
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