I$\text{'}$m coding a program using JavaFX using Scene Builder, I built a Sudoku class file but I$\text{'}$m still having trouble connecting it to an application and controller file. I$\text{'}$m hoping the program will have a $9$x$9$ grid where a sudoku puzzle will be generated and where the user can insert their response also a button to check once the grid is completed

to see if the puzzle is correct.

$//$Here is the Sudoku file

public class Sudoku

$\{$

int$[]$ mat$[]$;

int N; $//$ number of columns$/$rows$.$

int SRN; $//$ square root of N

int K; $//$ No$.$ Of missing digits

$//$ Constructor

Sudoku$($int N$,$ int K$)$

$\{$

this.N $=$ N;

this.K $=$ K;

$//$ Compute square root of N

Double SRNd $=$ Math.sqrt$($N$)$;

SRN $=$ SRNd$.$intValue$()$;

mat $=$ new int$[$N$][$N$]$;

$\}$

$//$ Sudoku Generator

public void fillValues$()$

$\{$

$//$ Fill the diagonal of SRN x SRN matrices

fillDiagonal$()$;

$//$ Fill remaining blocks

fillRemaining$(0,$ SRN$)$;

$//$ Remove Randomly K digits to make game

removeKDigits$()$;

$\}$

$//$ Fill the diagonal SRN number of SRN x SRN matrices

void fillDiagonal$()$

$\{$

for $($int i $=0$; ii$==$j

fillBox$($i$,$ i$)$;

$\}$

$//$ Returns false if given $3$ x $3$ block contains num.

boolean unUsedInBox$($int rowStart, int colStart, int num$)$

$\{$

for $($int i $=0$; i