Filling a matrix with random numbers

import java.util.Random;
public class CreateArrayWithRandomNumbers {

    public static void main(String[] args) {
        double[][] matrix1 = new double[8][6];

        for (int i=0; i<matrix1.length; i++){
            for (int j=0; j<matrix1[i].length; j++){
                matrix1[i][j] = (int)(Math.random()*100);
            }
        }

        // OR
        double[][] matrix2 = new double[8][6];
        Random ran = new Random();
        for (int i=0; i<matrix2.length; i++){
            for (int j=0; j<matrix2[i].length; j++){
                matrix2[i][j] = ran.nextDouble();
            }
        }
    }
}