[Solved] How to make an unique id for an object that is not random

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What about adding a globally unique identifier (GUID)?

A GUID is a 128-bit integer (16 bytes) that can be used across all computers and networks wherever a unique identifier is required. Such an identifier has a very low probability of being duplicated.

In Java, it is called a UUID. For example:

UUID uuid = java.util.UUID.randomUUID();

System.out.println(uuid.toString());

solved How to make an unique id for an object that is not random