The code when ran does not catch whether x$,0,$ or of its a tie. How to fix it$?$

package games.boards;

import java.awt.event.ActionEvent;

import javax.swing.JFrame;

import javax.swing.JOptionPane;

import javax.swing.SwingUtilities;

import java.awt.event.ActionListener;

public class TicTacToeGame extends JFrame $\{$

private Board gb;

private int turn;

public static void main$($String$[]$ args$)\{$

SwingUtilities.invokeLater$($new Runnable$()$

$\{$

public void run$()\{$

new TicTacToeGame$()$;

$\}$

$\})$;$\}$

static int$[][]$gameboard;

static final int EMPTY $=0$;

static final int NOUGHT $=-1$;

static final int CROSS $=1$;

$/*$ Set a square on the board must be empty $*/$

public static void set$($int val, int row, int col$)$ throws IllegalArgumentException $\{$

if $($gameboard$[$row$][$col$]==$ EMPTY$)$

gameboard$[$row$][$col$]=$ val;

else throw new IllegalArgumentException$("$Player already there!"$)$;

$\}$

public int getOutcome$()\{$

for $($int i $=0$; i $<3$; i$++)\{$

if $(($gameboard$[$i$][0]+$ gameboard$[$i$][1]+$ gameboard$[$i$][2]==3*$ NOUGHT$)||$

$($gameboard$[0][$i$]+$ gameboard$[1][$i$]+$ gameboard$[2][$i$]==3*$ NOUGHT$))\{$

return $-1$;

$\}$ else if $(($gameboard$[$i$][0]+$ gameboard$[$i$][1]+$ gameboard$[$i$][2]==3*$ CROSS$)||$

$($gameboard$[0][$i$]+$ gameboard$[1][$i$]+$ gameboard$[2][$i$]==3*$ CROSS$))\{$

return $1$;

$\}$

$\}$

$//$ Check diagonals

if $(($gameboard$[0][0]+$ gameboard$[1][1]+$ gameboard$[2][2]==3*$ NOUGHT$)||$

$($gameboard$[0][2]+$ gameboard$[1][1]+$ gameboard$[2][0]==3*$ NOUGHT$))\{$

return $-1$;

$\}$ else if $(($gameboard$[0][0]+$ gameboard$[1][1]+$ gameboard$[2][2]==3*$ CROSS$)||$

$($gameboard$[0][2]+$ gameboard$[1][1]+$ gameboard$[2][0]==3*$ CROSS$))\{$

return $1$;

$\}$

$//$ Check tie

for $($int i $=0$; i $<3$; i$++)\{$

for $($int j $=0$; j $<3$; j$++)\{$

if $($gameboard$[$i$][$j$]==$ EMPTY$)\{$

return $-2$;

$\}$

$\}$

$\}$

return $0$;

$\}$

public void takeTurn$($Cell c$)\{$

Mark curMark $=($turn$++\%2==0)?$

Mark.NOUGHT: Mark.CROSS;

gb$.$setCell$($curMark$,$c$.$getRow$(),$c$.$getColumn$())$;

int outcome $=$ getOutcome$()$;

JOptionPane.showMessageDialog$($this$,"")$;

System.exit$(0)$; $\}$

private TicTacToeGame$()\{$

gb $=$ new Board$(3,3,$ new ActionListener$()\{$

public void actionPerformed$($ActionEvent al$)\{$

Cell c $=($Cell$)$ al$.$getSource$()$;

takeTurn$($c$)$;

$\}$

$\})$;

this.add$($gb$)$;

this.setDefaultCloseOperation$($EXIT$\_$ON$\_$CLOSE$)$;

this.setTitle$("$TIC$-$TAC$-$TOE"$)$;

this.setSize$(300,300)$;

this.setVisible$($true$)$;

$\}$

$\}$