javafx - Tic Tac Toe Program -

i have tictactoe game , instructor wanted make wild tic tac toe. user needs able select if want x or o whenever. unsure of how this. have buttons need assign them actions, can please me out , how can make them play again? here tictactoe class. thank in advance.

import javafx.application.application;  import javafx.stage.stage;  import javafx.scene.scene;  import javafx.scene.control.label;  import javafx.scene.layout.borderpane;  import javafx.scene.layout.gridpane;  import javafx.scene.layout.pane;  import javafx.scene.paint.color;  import javafx.scene.shape.line;  import javafx.scene.shape.ellipse;  import javafx.scene.control.button;  import javafx.scene.layout.stackpane;  import javafx.scene.layout.vbox;  import javafx.scene.layout.hbox;  import javafx.geometry.pos;  import javafx.event.actionevent;  import javafx.event.eventhandler;  import javafx.application.platform;    public class tictactoe extends application {      private char whoseturn = 'x';      private cell[][] cell =  new cell[3][3];      private label lblstatus = new label("x's turn play");      @override     public void start(stage primarystage) {               button xbutton = new button("x");       button obutton = new button("o");       button exit = new button("exit");       button play = new button("play again?");       xbutton.setstyle("-fx-font-size: 15pt;");       obutton.setstyle("-fx-font-size: 15pt;");       exit.setstyle("-fx-font-size: 15pt;");       play.setstyle("-fx-font-size: 15pt;");              exit.setonaction(new eventhandler<actionevent>()       {           @override            public void handle(actionevent e) {               platform.exit();              }          });             gridpane pane = new gridpane();       (int = 0; < 3; i++)        (int j = 0; j < 3; j++)          pane.add(cell[i][j] = new cell(), j, i);        borderpane borderpane = new borderpane();      borderpane.setcenter(pane);      borderpane.setbottom(lblstatus);            hbox buttonbar = new hbox();      buttonbar.setspacing(87.0);      buttonbar.getchildren().addall(xbutton, obutton, play,exit);        borderpane.settop(buttonbar);                 scene scene = new scene(borderpane, 550, 470);      primarystage.settitle("wild tictactoe");       primarystage.setscene(scene);       primarystage.show();          primarystage.setresizable(false);            }      /** determine if cell occupied */    public boolean isfull() {      (int = 0; < 3; i++)        (int j = 0; j < 3; j++)          if (cell[i][j].gettoken() == ' ')            return false;        return true;    }      /** determine if player specified token wins */    public boolean iswon(char token) {      (int = 0; < 3; i++)        if (cell[i][0].gettoken() == token            && cell[i][1].gettoken() == token            && cell[i][2].gettoken() == token) {          return true;        }        (int j = 0; j < 3; j++)        if (cell[0][j].gettoken() ==  token            && cell[1][j].gettoken() == token            && cell[2][j].gettoken() == token) {          return true;        }        if (cell[0][0].gettoken() == token           && cell[1][1].gettoken() == token                  && cell[2][2].gettoken() == token) {        return true;      }        if (cell[0][2].gettoken() == token          && cell[1][1].gettoken() == token          && cell[2][0].gettoken() == token) {        return true;      }        return false;    }          public class cell extends pane {            private char token = ' ';        public cell() {        setstyle("-fx-border-color: black");         this.setprefsize(2000, 2000);        this.setonmouseclicked(e -> handlemouseclick());      }        /** return token */      public char gettoken() {        return token;      }        /** set new token */      public void settoken(char c) {        token = c;                if (token == 'x') {          line line1 = new line(10, 10,             this.getwidth() - 10, this.getheight() - 10);          line1.endxproperty().bind(this.widthproperty().subtract(10));          line1.endyproperty().bind(this.heightproperty().subtract(10));          line line2 = new line(10, this.getheight() - 10,             this.getwidth() - 10, 10);          line2.startyproperty().bind(            this.heightproperty().subtract(10));          line2.endxproperty().bind(this.widthproperty().subtract(10));                    // add lines pane          this.getchildren().addall(line1, line2);         }        else if (token == 'o') {          ellipse ellipse = new ellipse(this.getwidth() / 2,             this.getheight() / 2, this.getwidth() / 2 - 10,             this.getheight() / 2 - 10);          ellipse.centerxproperty().bind(            this.widthproperty().divide(2));          ellipse.centeryproperty().bind(              this.heightproperty().divide(2));          ellipse.radiusxproperty().bind(              this.widthproperty().divide(2).subtract(10));                  ellipse.radiusyproperty().bind(              this.heightproperty().divide(2).subtract(10));             ellipse.setstroke(color.black);          ellipse.setfill(color.white);                    getchildren().add(ellipse); // add ellipse pane        }      }        /* handle mouse click event */      private void handlemouseclick() {        // if cell empty , game not on        if (token == ' ' && whoseturn != ' ') {          settoken(whoseturn); // set token in cell            // check game status          if (iswon(whoseturn)) {            lblstatus.settext(whoseturn + " won! game over. play again?");            whoseturn = ' '; // game on          }          else if (isfull()) {            lblstatus.settext("draw! game over. play again?");            whoseturn = ' '; // game on          }          else {            // change turn            whoseturn = (whoseturn == 'x') ? 'o' : 'x';            // display turn            lblstatus.settext(whoseturn + "'s turn.");          }        }      }    }        /**     * main method needed ide limited     * javafx support. not needed running command line.     */    public static void main(string[] args) {      launch(args);    }  }

if want allow player choose piece (x or o), easiest way decouple presentation use of pieces.

by that, mean have player represented within program integer 1 , computer 0. never changes , logic uses these values.

when displaying board however, translate value correct form.

so, 2 things. first, allow user choose pieces (psuedo-code):

def piece array[2] computer = 0 player   = 1 if playerwantstobex:     piece[computer] = 'o'     piece[player]   = 'x' else:     piece[computer] = 'x'     piece[player]   = 'o' 

then, when presenting board, use values. whereas before have had like:

    print cell[x,y] 

now have:

    print piece[cell[x,y]]