how to generate unique numbers in java code example

Example 1: generate random number in java

import java.lang.Math;

int randomNumber;

int minimum = 1;
int maximum = 10 - minimum;

randomNumber = (int)((Math.random()*maximum) + minimum);

System.out.println("Random Number (Between 1-10): " + randomNumber);

Example 2: java random usage

import java.util.Random;

Random rndm = new Random();
int mnmbr = 10;

int rndNumber = rndm.nextInt(mnumber) + 1;

System.out.println(rndNumber);