Sorry last one was typed incorrect. Here I have a code that displays and gives solution so how can I make it so I am righting my answer but if its wrong it says incorrect and if I am right it says correct will still showing the solution?

public class SudokuPuzzle$\{$

public boolean isSafe$($int$[][]$ b$,$ int r$,$ int c$,$ int n$)$

$\{$

for $($int d $=0$; d $<$ b$.$length; d$++)$

$\{$

if $($b$[$r$][$d$]==$ n$)$

$\{$

return false;

$\}$

$\}$

for $($int r$1=0$; r$1<$ b$.$length; r$1++)$

$\{$

if $($b$[$r$1][$c$]==$ n$)$

$\{$

return false;

$\}$

$\}$

int sqt $=($int$)$Math$.$sqrt$($b$.$length$)$;

int boxRowSt $=$ r $-$ r $\%$ sqt;

int boxColSt $=$ c $-$ c $\%$ sqt;

for $($int r$1=$ boxRowSt; r$1<$ boxRowSt $+$ sqt; r$1++)$

$\{$

for $($int d $=$ boxColSt; d $<$ boxColSt $+$ sqt; d$++)$

$\{$

if $($b$[$r$1][$d$]==$ n$)$

$\{$

return false;

$\}$

$\}$

$\}$

return true;

$\}$

public boolean solveSudoku$($int$[][]$ b$,$ int num$)$

$\{$

int r $=-1$;

int c $=-1$;

boolean isVacant $=$ true;

for $($int i $=0$; i $<$ num; i$++)$

$\{$

for $($int j $=0$; j $<$ num; j$++)$

$\{$

if $($b$[$i$][$j$]==0)$

$\{$

r $=$ i;

c $=$ j;

isVacant $=$ false;

break;

$\}$

$\}$

if $(!$isVacant$)$

$\{$

break;

$\}$

$\}$

if $($isVacant$)$

$\{$

return true;

$\}$

for $($int no $=1$; no $<=$ num; no$++)$

$\{$

if $($isSafe$($b$,$ r$,$ c$,$ no$))$

$\{$

b$[$r$][$c$]=$ no;

if $($solveSudoku$($b$,$ num$))$

$\{$

return true;

$\}$

else

$\{$

b$[$r$][$c$]=0$;

$\}$

$\}$

$\}$

return false;

$\}$

public void display$($int$[][]$ b$,$ int n$)$

$\{$

for $($int i $=0$; i $<$ n; i$++)$

$\{$

for $($int d $=0$; d $<$ n; d$++)$

$\{$

System.out.print$($b$[$i$][$d$])$;

System.out.print$("")$;

$\}$

System.out.print$("$

$")$;

if $(($i $+1)\%($int$)$Math$.$sqrt$($n$)==0)$

$\{$

System.out.print$("")$;

$\}$

$\}$

$\}$

$//$ main method

public static void main$($String argvs$[])$

$\{$

$//$ the $9$ x $9$ grid

int$[][]$ b $=$ new int$[][]\{\{7,0,0,0,0,0,2,0,0\},$

$\{4,0,2,0,0,0,0,0,3\},$

$\{0,0,0,2,0,1,0,0,0\},$

$\{3,0,0,1,8,0,0,9,7\},$

$\{0,0,9,0,7,0,6,0,0\},$

$\{6,5,0,0,3,2,0,0,1\},$

$\{0,0,0,4,0,9,0,0,0\},$

$\{5,0,0,0,0,0,1,0,6\},$

$\{0,0,6,0,0,0,0,0,8\}$

$\}$ ;

SudokuPuzzle obj $=$ new SudokuPuzzle$()$;

int size $=$ b$.$length;

System.out.println$("$The grid is: $")$;

for$($int i $=0$; i $<$ size; i$++)$

$\{$

for$($int j $=0$; j $<$ size; j$++)$

$\{$

System.out.print$($b$[$i$][$j$]+"")$;

$\}$

System.out.println$()$;

$\}$

System.out.println$()$;

if $($obj$.$solveSudoku$($b$,$ size$))$

$\{$

System.out.println$("$The solution of the grid is: $")$;

obj.display$($b$,$ size$)$;

$\}$

else

$\{$

System.out.println$("$There is no solution available."$)$;

$\}$

$\}$

$\}$