I have a question about randomizing a number from a range without using the random library and similar. I have seen the use of a method to generate noise from a microphone, but it does not have a given range. Is there anything else? Because I couldn't find any more example of using it with user input (like CPU temp or current date). by guralover36 in StackOverflow on June 05, 2022 . Answer Well, this isn't truly random as I mentioned in the comments. But it does what you ask. min - smallest value in range (inclusive) max - largest value in range (exclusive) So the range is from min to max-1 inclusive. public static long rand(int min, int max) { return (System.nanoTime()%(max-min)) + min; } by WJS on June 05, 2022 .