Check out example codes for "random int java". It will help you in understanding the concepts better.

Code Example 1

import java.util.Random;

Random rand = new Random();

//the 5 is the upper bound so it will choose a random number
//from 0 to 5
int random = rand.nextInt(5);

Code Example 2

import java.util.Random;

Random rand = new Random();

// Obtain a number between [0 - 49].
int n = rand.nextInt(50);

// Add 1 to the result to get a number from the required range
// (i.e., [1 - 50]).
n += 1;

Code Example 3

(int)(Math.random() * ((max - min) + 1)) + min
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Code Example 4

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

Code Example 5

import java.util.Random;

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

Code Example 6

Random random = new Random();   
// Generates random integers 0 to 49  
int x = random.nextInt(50);

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