Hello, I$\text{'}$m having issues implementing my animation timer and getting my program to run. This program is suppose to mimic the game asteroids. Can someone help fix my line of code below so it runs properly? In JAVA.

public abstract class Character $\{$

private Polygon character;

private Point$2$D movement;

public Character$($Polygon polygon, int x$,$ int y$)\{$

this.character $=$ polygon;

this.character.setTranslateX$($x$)$;

this.character.setTranslateY$($y$)$;

this.movement $=$ new Point$2$D$(0,0)$;

$\}$

public Polygon getCharacter$()\{$

return character;

$\}$

public void turnLeft$()\{$

this.character.setRotate$($this$.$character.getRotate$()-5)$;

$\}$

public void turnRight$()\{$

this.character.setRotate$($this$.$character.getRotate$()+5)$;

$\}$

public void move$()\{$

this.character.setTranslateX$($this$.$character.getTranslateX$()+$ this.movement.getX$())$;

this.character.setTranslateY$($this$.$character.getTranslateY$()+$ this.movement.getY$())$;

$//$ Wrap around the screen

if $($this$.$character.getTranslateX$()<0)\{$

this.character.setTranslateX$($this$.$character.getTranslateX$()+$ AsteroidsApplication.LEVEYS$)$;

$\}$

if $($this$.$character.getTranslateX$()>$ AsteroidsApplication.LEVEYS$)\{$

this.character.setTranslateX$($this$.$character.getTranslateX$()\%$ AsteroidsApplication.LEVEYS$)$;

$\}$

if $($this$.$character.getTranslateY$()<0)\{$

this.character.setTranslateY$($this$.$character.getTranslateY$()+$ AsteroidsApplication.KORKEUS$)$;

$\}$

if $($this$.$character.getTranslateY$()>$ AsteroidsApplication.KORKEUS$)\{$

this.character.setTranslateY$($this$.$character.getTranslateY$()\%$ AsteroidsApplication.KORKEUS$)$;

$\}$

$\}$

public void accelerate$()\{$

double changeX $=$ Math.cos$($Math$.$toRadians$($this$.$character.getRotate$()))$;

double changeY $=$ Math.sin$($Math$.$toRadians$($this$.$character.getRotate$()))$;

changeX $*=0\mathrm{.}05$;

changeY $*=0\mathrm{.}05$;

this.movement $=$ this.movement.add$($changeX$,$ changeY$)$;

$\}$

$\}$

public class AsteroidsApplication extends Application $\{$

public static int WIDTH $=300$;

public static int HEIGHT $=200$;

public static int BUFFER$\_$SIZE $=2$; $//$ Buffer size for animation timer

public static int LEVEYS $=100$; $//$ Placeholder value

public static int KORKEUS $=100$; $//$ Placeholder value

private List pressedKeys $=$ new ArrayList$<>()$;

private List projectiles $=$ new ArrayList$<>()$;

private List asteroids $=$ new ArrayList$<>()$;

private Ship ship;

@Override

public void start$($Stage stage$)$ throws Exception $\{$

Pane pane $=$ new Pane$()$;

pane.setPrefSize$($WIDTH$,$ HEIGHT$)$;

ship $=$ new Ship$($WIDTH $/2,$ HEIGHT $/2)$;

for $($int i $=0$; i $<5$; i$++)\{$

Random rnd $=$ new Random$()$;

Asteroid asteroid $=$ new Asteroid$($rnd$.$nextInt$($WIDTH $/3),$ rnd$.$nextInt$($HEIGHT$))$;

asteroids.add$($asteroid$)$;

$\}$

pane.getChildren$().$add$($ship$.$getCharacter$())$;

asteroids.forEach$($asteroid $->$ pane.getChildren$().$add$($asteroid$.$getCharacter$()))$;

Scene scene $=$ new Scene$($pane$)$;

scene.setOnKeyPressed$($event $->\{$

KeyCode keyCode $=$ event.getCode$()$;

if $(!$pressedKeys.contains$($keyCode$))\{$

pressedKeys.add$($keyCode$)$;

$\}$

$\})$;

scene.setOnKeyReleased$($event $->$ pressedKeys.remove$($event$.$getCode$()))$;

stage.setScene$($scene$)$;

stage.show$()$;

new AnimationTimer$()\{$

@Override

public void handle$($long now$)\{$

if $($pressedKeys$.$contains$($KeyCode$.$LEFT$))\{$

ship.turnLeft$()$;

$\}$

if $($pressedKeys$.$contains$($KeyCode$.$RIGHT$))\{$

ship.turnRight$()$;

$\}$

if $($pressedKeys$.$contains$($KeyCode$.$UP$))\{$

ship.accelerate$()$;

$\}$

ship.move$()$;

asteroids.forEach$($Asteroid::move$)$;

projectiles.forEach$($Projectile::move$)$;

asteroids.forEach$($asteroid $->\{$

if $($ship$.$collide$($asteroid$))\{$

stop$()$;

$\}$

$\})$;

$\}$

$\}.$start$()$;

$\}$

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

launch$($args$)$;

$\}$

$\}$

public class Ship extends Character $\{$

public Ship$($int x$,$ int y$)\{$

super$($new Polygon$(-5,-5,10,0,-5,5),$ x$,$ y$)$;

$\}$

$\}$

public class Projectile extends Character $\{$

public Projectile$($int x$,$ int y$)\{$

super$($new Polygon$(2,-2,2,2,-2,2,-2,-2),$ x$,$ y$)$;

$\}$

$\}$

public class PolygonFactory $\{$

public Polygon createPolygon$()\{$

Random rnd $=$ new Random$()$;

double size $=10+$ rnd$.$nextInt$(10)$;

Polygon polygon $=$ new Polygon$()$;

double c$1=$ Math.cos$($Math$.$PI $*2/5)$;

double c$2=$ Math.cos$($Math$.$PI $/5)$;

double s$1=$ Math.sin$($Math$.$PI $*2/5)$;

double s$2=$ Math.sin$($Math$.$PI $*4/5)$;

polygon.getPoints$().$addAll$($

size, $0\mathrm{.}0,$

size $*$ c$1,-1*$ size $*$ s$1,$

$-1*$ size $*$ c$2,-1*$ size $*$ s$2,$

$-1*$ size $*$ c$2,$ size $*$ s$2,$

size $*$ c$1,$ size $*$ s$1)$;

for $($int i $=0$; i $<$ polygon.getPoints$().$size$()$; i$++)\{$

int change $=$ rnd$.$nextInt$(5)-2$;

polygon.getPoints$().$set$($i$,$ polygon.getPoints$().$get$($i$)+$ change$)$;

$\}$

return polygon;

$\}$

$\}$

public class Asteroid extends Character $\{$

private double rotationalMovement;

public Asteroid$($int x$,$ int y$)\{$

super$($new PolygonFactory$().$createPolygon$(),$ x$,$ y$)$;

Random rnd $=$ new Random$()$;

super.getCharacter$().$setRotate$($rnd$.$nextInt$(360))$;

int accelerationAmount $=1+$ rnd$.$nextInt$(10)$;

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

accelerate$()$;

$\}$

this.rotationalMovement $=0\mathrm{.}5-$ rnd$.$nextDouble$()$;

$\}$

@Override

public void move$()\{$

super.move$()$;

super.getCharacter$().$setRotate$($super$.$getCharacter$().$getRotate$()+$ rotationalMovement$)$;

$\}$

$\}$