Miscellany

    int a[][] = new int[5][10];
    int n = 0;

    // make array
    for(int i = 0; i < 5; i++)
    {
        for (int j = 0; j < 10; j++)
        {
            a[i][j] = n;
            n++;
        }
    }

    // read array
    for (int i = 0; i < 5; i++)
    {
        for (int j = 0; j < 10; j++)
        {
            System.out.print(a[i][j]+" ");
        }
        System.out.print("\n");
    }