How to pass the rendered array?

Question

Java

Good afternoon!
I need help, I can’t either drive the output array into the method, or correctly call the method with the correct parameters.

import java.util.Scanner;
import static java.lang.Math.*;
public class OneDimensionalArray {
          //создание и заполнение массива
    static double createRandomArray(int size) {
        double[][] da = new double[size][size];
        for(int i=0; i<da.length; i++) {
            for(int j=0; j<da[i].length; j++) {
                da[i][j] = (Math.random()*100);
            }
        }
        for(int i=0; i<da.length; i++) {
            for(int j=0; j<da[i].length; j++) {
                System.out.print(da[i][j] + "\t");
            }
            System.out.println();
        }
        return 0;
        }
    //задание найти среднее арифметическое - сумма всех чисел деленная на их количество
     static double mean(double[][] array) {
        double total=0;
        int totallength = 0;
        for(int i=0;i<array.length;i++) {
            for(int j=0;j<array[i].length;j++) {
                total += array[i][j];
                totallength++;
            }
        }
        return total/(totallength);
    }
                //майн
    public static void main(String args[]) {
        Scanner num = new Scanner(System.in);
        System.out.println ("Введите размер матрицы ");
        int size= num.nextInt();//считывает число и присваивает значение в size
        System.out.println("Вы ввели  размер "    +size);
        System.out.println("Матрица :  " );
        createRandomArray(size);
        System.out.println("Среднее арифметическое :  " );
        
    }


}

The array is displayed, but there is a problem with the average over the array, the method seems to be correct, but there is a problem with its use.
Wait, in the code, the method call itself was removed at the very end. If anyone can help, thank you..

Answer 1

Your double[][] da = new double[size][size] is not visible anywhere else except in the createRandomArray method.
The method must return an array in return or in parameters.
Or make da a global variable and use it in all methods, but that would be bad manners.