How to send random class to the new method as an argument

How to send random class to the new method as an argument?

package practice;

import java.util.Random;

public class test {

    public static void main(String[] args) {
        Random generator= new Random(seed);
        
        fillMatrixRandom(generator);
        
        
        public static void fillMatrixRandom(int generator) {

    }

}