how to make random numbers in java with no repeat and range code example

Example 1: random number in range java

(int)(Math.random() * ((max - min) + 1)) + min
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Example 2: java generate random integer in range

import java.util.concurrent.ThreadLocalRandom;

// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = ThreadLocalRandom.current().nextInt(min, max + 1);