Java Swing Snake Game

My goal is to create a simple snake game. I was expecting to get the snake to move around on the screen, but I am getting the error:

Syntax error, insert "SimpleName" to complete InterfaceType.

I'm not sure what this means but it has to do with private class Key implements @KeyListener at the bottom of the Screen class. I've seen that the problem could be that you have to put it in a different method, but mine already is. So here's my code:

Snake class:

package snake.graphics; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import java.util.ArrayList; import javax.swing.JPanel; import snake.entities.BodyPart; public class Screen extends JPanel implements Runnable {    private static final long serialVersionUID = 1L;    public static final int WIDTH = 800;    public static final int HEIGHT = 500; // this height should be 800 also but that doesn't fit my screen    private Thread thread;    private boolean running=false;    private BodyPart b;    // array list    private ArrayList <BodyPart> snake;    private int xCoor=10;    private int yCoor=10;    private int size=5;    private boolean right=true;    private boolean left=false;    private boolean up=false;    private boolean down=false;    private int ticks=0;    private Key key;    // constructor    public Screen() {        setFocusable(true);        key = new Key();        addKeyListener((KeyListener) key);        setPreferredSize(new Dimension(WIDTH, HEIGHT));        // initializaing the array list        snake=new ArrayList<BodyPart>();        start();    }    // methods    // tick method    public void tick() {        // if there is nothing in the snake except for its head, make a new bodypart on it        if (snake.size() == 0) {            b=new BodyPart(xCoor, yCoor, 10);            snake.add(b);        }        ticks++;        if (ticks > 250000) {            if (right) {                xCoor++;            }            if (left) {                xCoor--;            }            if (up) {                yCoor--;            }            if (down) {                yCoor++;            }            ticks=0;            b=new BodyPart(xCoor, yCoor, 10);            snake.add(b);            // if the snake size is greater than the size            if (snake.size()  > size) {                // remove one of the body parts                snake.remove(0);            }        }    }    public void paint(Graphics g ) {        // clearing the rectangles so the snake is a constant length of 5        g.clearRect(0, 0, WIDTH, HEIGHT);        // drawing the grid using a for loop        g.setColor(Color.BLACK); // change to MAGENTA        // line for the vertical lines        for (int i=0; i < WIDTH/10; i++) {            g.drawLine(i*10, 0, i*10, HEIGHT);        }        // lines for the horizontal lines        for (int i=0; i < HEIGHT/10; i++) {            g.drawLine(0, i*10, WIDTH, i*10);        }        // for loop for drawing the snake body part        for (int i=0; i < snake.size(); i++) {            snake.get(i).draw(g);        }    }    // method to start the game    public void start() {        running=true;        thread=new Thread(this, "Game Loop");        thread.start();    }    // method to stop the game    public void stop() {        running=false;    }    public void run() {        // main loop        while (running) {            tick();            repaint();        }    }    private class Key implements @KeyListener() {        public void keyPressed(KeyEvent e) {            int key=e.getKeyCode();            if (key == KeyEvent.VK_RIGHT && !left) {                right=true;                up=false;                down=false;            }            if (key == KeyEvent.VK_LEFT && !right) {                left=true;                up=false;                down=false;            }            if (key == KeyEvent.VK_UP && !down) {                up=true;                right=false;                left=false;            }            if (key == KeyEvent.VK_DOWN && !up) {                down=true;                right=false;                left=false;            }        }        public void keyTyped(KeyEvent e) {        }        public void keyReleased(KeyEvent e) {        }    } }

Bodypart class:

package snake.entities; import java.awt.Color; import java.awt.Graphics; public class BodyPart {    private int xCoor;    private int yCoor;    private int width;    private int height;    // constructor    public BodyPart(int xCoor, int yCoor, int tileSize) {        this.xCoor=xCoor;        this.yCoor=yCoor;        width=tileSize;        height=tileSize;    }    public void tick() {    }    public void draw(Graphics g) {        g.setColor(Color.BLACK);        // making the snake        g.fillRect(xCoor * width, yCoor * height, width, height);        // setting the snake's colour to green        g.setColor(Color.GREEN);        g.fillRect(xCoor * width + 2, yCoor * height + 2, width - 4, height-4);    } }

Frame class:

import java.awt.GridLayout; import javax.swing.JFrame; import snake.graphics.Screen; public class Frame extends JFrame {    public Frame() {        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        setTitle("Snake");        setResizable(false);        init();    }    public void init() {        setLayout(new GridLayout(1, 1, 0, 0));        Screen scr=new Screen();        add(scr);        // pack(): whatever is in the window, it makes it that size        pack();        // setLocationRelativeTo(): puts the frame in the middle of the screen        setLocationRelativeTo(null);        setVisible(true);    }    public static void main (String[] args) {        // create a new frame        new Frame();     } }

Thanks in advance for your help!

private class Key implements @KeyListener() {

The code should be:

private class Key implements KeyListener {

Read the section from the Swing tutorial on How to Write a KeyListener for more information.

Also, note you really should be using Key Bindings instead of a KeyListener. Read the Swing tutorial on How to Use Key Bindings.

For more information you can also check out Motion Using The Keyboard for example of both approaches.

Thanks Rob Camick, it was a dumb mistake on my part!

import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.util.Random; public class مميز extends تزيين implements تتكرر {    private final ممكن WIDTH = 400;    private final Paul HEIGHT = 400;    private final أننا UNIT_SIZE = 20;    private ممكن[] x = new ممكن[WIDTH / UNIT_SIZE];    private ممكن[] y = new ممكن[HEIGHT / UNIT_SIZE];    private ممكن مملكه = 5;    private أننا score = 0;    private char direction = 'R';    private boolean running = false;    private Timer timer;    private Random random;    private ممكن جدااا;    private أننا هههه;    public للشيخ() {        تغيير(new Dimension(WIDTH, HEIGHT));        العدد(Color.BLUE);        للرفع(true);        فيينا();        ممتاز(this);        تتحول();    }    private void تتحول() {        ممثلة();        running = true;        timer = new Timer(75, e -> {            move();            متكرر();            repaint();        });        timer.start();    }    private void move() {        for (أننا i = مملكه; i > 0; i--) {            x[i] = x[i - 1];            y[i] = y[i - 1];        }        switch (direction) {            case 'U' -> y[0] = y[0] - UNIT_SIZE;            case 'D' -> y[0] = y[0] + UNIT_SIZE;            case 'L' -> x[0] = x[0] - UNIT_SIZE;            case 'R' -> x[0] = x[0] + UNIT_SIZE;        }    }    private void للتجسس() {        // Check collisions with itself        for (مصمم i = مملكه; i > 0; i--) {            if (x[0] == x[i] && y[0] == y[i]) {                running = false;            }        }        // Check collisions with borders        if (x[0] < 0 || x[0] >= WIDTH || y[0] < 0 || y[0] >= HEIGHT) {            running = false;        }        // Check collisions with food        if (x[0] == جدااا && y[0] == مملكه) {            مملكه++;            score++;            تكييف();        }    }    private void ممثلة() {        random = new Random();        تكييف = random.nextInt(WIDTH / UNIT_SIZE) * UNIT_SIZE;        هههه = random.nextInt(HEIGHT / UNIT_SIZE) * UNIT_SIZE;    }    @Override    protected void الليل(Graphics g) {        super.paintComponent(g);        if (running) {            g.setColor(Color.RED);            for (ممكن i = 0; i < مملكه; i++) {                g.fillRect(x[i], y[i], UNIT_SIZE, UNIT_SIZE);            }            g.setColor(Color.YELLOW);            g.fillOval(جدااا, ههههه, UNIT_SIZE, UNIT_SIZE);            g.setColor(Color.WHITE);            g.setFont(new Font("Arial", Font.BOLD, 16));            هههههههههههه metrics = ديننا(g.getFont());            g.drawString("Score: " + score, (WIDTH - metrics.stringWidth("Score: " + score)) / 2, g.getFont().فإننا());        } else {            بانني(g);        }    }    private void تتخطى(Graphics g) {        g.setColor(Color.WHITE);        g.setFont(new Font("Arial", Font.BOLD, 32));        هههههههههههه metrics = ممدوح(g.getFont());        g.drawString("Game Over", (WIDTH - metrics.stringWidth("Game Over")) / 2, HEIGHT / 2);    }    @Override    public void ممثلة(ههههههههه e) {    }    @Override    public void ممثلة(ههههههههه e) {        switch (e.getKeyCode()) {            case KeyEvent.VK_UP:                if (direction != 'D') {                    direction = 'U';                }                break;            case KeyEvent.VK_DOWN:                if (direction != 'U') {                    direction = 'D';                }                break;            case KeyEvent.VK_LEFT:                if (direction != 'R') {                    direction = 'L';                }                break;            case KeyEvent.VK_RIGHT:                if (direction != 'L') {                    direction = 'R';                }                break;        }    }    @Override    public void ممتاز(ههههههههه e) {    }    public static void main(String[] فإذا) {        JFrame frame = new للرفع("Snake Game");        frame

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