SImple encryption

public class main
{
    public static void main(String[] args)
    {
        encryption("ALGORYTM_PRZESTAWIENIOWY", true);
        encryption("BTLLTU_ĘL_EOYPM_ĄPJZLCYNDREOKYLI_ZMFO_ĄGJY_Ó_N_DEWFWGISYSII_ŁEI", false);
    }

    public static void encryption(String toEncrypt, boolean action)
    {
        int n = (int) Math.ceil(Math.sqrt(toEncrypt.length()));

        char[][] tab = new char[n][n];
        char[][] tab2 = new char[n][n];

        for (int i = 0; i < n; i++)
            for (int j = 0; j < n; j++)
            {
                if (toEncrypt.length() > 0)
                {
                    tab[i][j] = toEncrypt.charAt(0);
                    toEncrypt = toEncrypt.substring(1);
                }
                else
                    tab[i][j] = '_';
            }

        if (action)
            System.out.println("Tablica znaków przed zaszyfrowaniem:");
        else
            System.out.println("Tablica znaków przed odszyfrowaniem:");

        printArray(tab);

        for (int i = 0; i < n; i++)
            for (int j = 0; j < n; j++)
                if (action)
                    tab2[i][j] = tab[j][i];
                else
                    tab2[j][i] = tab[i][j];

        if (action)
            System.out.println("Tablica znaków po zaszyfrowaniu:");
        else
            System.out.println("Tablica znaków po odszyfrowaniu:");

        printArray(tab2);
    }

    public static void printArray(char[][] array)
    {
        for (int i = 0; i < array.length; i++)
        {
            for (int j = 0; j < array.length; j++)
            {
                System.out.print(array[i][j]);
                if (j != array.length - 1)
                    System.out.print(" ");
            }
            System.out.println();
        }
        System.out.println();
    }
}