$***$JavaFX$****$I can't get my button to 'roll' the dice images, and I had the images displayed but now it keeps giving me errors. Help???

import java.io$.$FileInputStream;

import java.io$.$FileNotFoundException;

import java.io$.$InputStream;

import javafx.application.Application;

import javafx.event.ActionEvent;

import javafx.event.EventHandler;

import javafx.geometry.Pos;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.image.Image;

import javafx.scene.image.ImageView;

import javafx.scene.layout.BorderPane;

import javafx.scene.layout.StackPane;

import javafx.scene.layout.VBox;

import javafx.stage.Stage;

public class RollingDice extends Application $\{$

@Override

public void start$($Stage primaryStage$)$ throws FileNotFoundException$\{$

DicePane dice $=$ new DicePane$()$;

VBox pane $=$ new VBox$()$;

pane.setSpacing$(50)$;

pane.setAlignment$($Pos$.$CENTER$)$;

Button btRoll $=$ new Button$("$Roll$")$;

pane.getChildren$().$add$($btRoll$)$;

btRoll.setOnAction$($new DiceRoll$())$;

BorderPane borderPane $=$ new BorderPane$()$;

borderPane.setCenter$($dice$)$;

borderPane.setBottom$($pane$)$;

Scene scene $=$ new Scene$($borderPane$,500,300)$;

primaryStage.setTitle$("$Roll Dice"$)$;

primaryStage.setScene$($scene$)$;

primaryStage.show$()$;

$\}$

class DiceRoll implements EventHandler$\{$

@Override

public void handle $($ActionEvent e$)\{$

DicePane.roll$()$;

$\}$

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

launch$($args$)$;

$\}$

$\}$

class DicePane extends StackPane$\{$

private static ImageView imageView;

public DicePane$()$ throws FileNotFoundException$\{$

getChildren$().$add$($imageView$)$;

setAlignment$($Pos$.$CENTER$)$;

roll$()$;

$\}$

public static void roll$()$ throws FileNotFoundException$\{$

int randomDie $=(($int$)$Math$.$random$()*5)+1$;

switch$($randomDie$)\{$

case $1$: InputStream oneGraphic $=$ new FileInputStream$("$src$/$dice$/$one$.$png$")$;

Image oneSide $=$ new Image$($oneGraphic$)$;

imageView $=$ new ImageView$($oneSide$)$;

break;

case $2$: InputStream twoGraphic $=$ new FileInputStream$("$src$/$dice$/$two$.$png$")$;

Image twoSide $=$ new Image$($twoGraphic$)$;

imageView $=$ new ImageView$($twoSide$)$;

break;

case $3$: InputStream threeGraphic $=$ new FileInputStream$("$src$/$dice$/$three$.$png$")$;

Image threeSide $=$ new Image$($threeGraphic$)$;

imageView $=$ new ImageView$($threeSide$)$;

break;

case $4$: InputStream fourGraphic $=$ new FileInputStream$("$src$/$dice$/$for$.$png$")$;

Image fourSide $=$ new Image$($fourGraphic$)$;

imageView $=$ new ImageView$($fourSide$)$;

break;

case $5$: InputStream fiveGraphic $=$ new FileInputStream$("$src$/$dice$/$five$.$png$")$;

Image fiveSide $=$ new Image$($fiveGraphic$)$;

imageView $=$ new ImageView$($fiveSide$)$;

break;

case $6$: InputStream sixGraphic $=$ new FileInputStream$("$src$/$dice$/$six$.$png$")$;

Image sixSide $=$ new Image$($sixGraphic$)$;

imageView $=$ new ImageView$($sixSide$)$;

break;

$\}$

$\}$

$\}$

$\}$