generate random number in java within a range without repeating code example

Example 1: java random numbers in specific range

import java.util.Random;

Random rand = new Random();
int random_integer = rand.nextInt(upperbound-lowerbound) + lowerbound;

Example 2: generate random number in java within a range without repeating with android studio

public void NextRandom(View view) // button clicked function
    {
        int previousIndex = index;
        index = rand.nextInt(array.size());

        while (index == previousIndex)
        {
            index = rand.nextInt(array.size());
        }
    }

Example 3: java random number generator in range

int rand = ThreadLocalRandom.current().nextInt(x,y);