Как правильно прописать старт программы - Java

package snake1;
 
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.Timer;
 
public class Snake1 extends JPanel implements ActionListener {
 
    public static final int SCALE = 32;
    public static final int WIDTH = 20;
    public static final int HEIGHT = 20;
    public static final int SPEED = 120;
 
    Food a = new Food((int) (Math.random() * WIDTH), (int) (Math.random() * HEIGHT));
    Snake s = new Snake(10, 10, 9, 10);
    Timer t = new Timer(SPEED, this);
 
    public Snake1() { //konstruktor
        t.start();
        addKeyListener(new Keyboard());
        setFocusable(true);
    }
 
    public void paint(Graphics g) {
        g.setColor(color(255, 140, 0));
        g.fillRect(0, 0, WIDTH * SCALE, HEIGHT * SCALE);
        g.setColor(color(192, 192, 192));
 
        for (int xx = 0; xx <= WIDTH * SCALE; xx += SCALE) {
            g.drawLine(xx, 0, xx, HEIGHT * SCALE);
        }
 
        for (int yy = 0; yy <= HEIGHT * SCALE; yy += SCALE) {
            g.drawLine(0, yy, WIDTH * SCALE, yy);
        }
 
        for (int d = 0; d < s.length; d++) {
            g.setColor(color(20, 30, 150));
            g.fillRect(s.snakeX[d] * SCALE + 1, s.snakeY[d] * SCALE + 1, SCALE - 1, SCALE - 1);
        }
 
        g.setColor(color(255, 0, 0));
        g.fillRect(a.posX * SCALE + 1, a.posY * SCALE + 1, SCALE - 1, SCALE - 1);
    }
 
    public Color color(int red, int green, int blue) {
        return new Color(red, green, blue);
    }
 
    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setResizable(false);
        f.setSize(WIDTH * SCALE, HEIGHT * SCALE + 20);
        f.setLocationRelativeTo(null);
        f.add(new Snake1());
        f.setVisible(true);
        //TOHLE JSEM PRIDAL
        addMenu(f);
 
    }
 
    @Override
    public void actionPerformed(ActionEvent arg0) {
        s.move();
        if ((s.snakeX[0] == a.posX) & (s.snakeY[0] == a.posY)) {
            a.setRandomPosition();
            s.length++;
 
        }
        for (int k = 1; k < s.length; k++) {
            if ((s.snakeX[k] == a.posX) & (s.snakeY[k] == a.posY)) {
                a.setRandomPosition();
            }
            if ((s.snakeX[0] == a.posX) & (s.snakeY[0] == a.posY)) {
                a.setRandomPosition();
                s.length++;
            }
        }
        repaint();
 
    }
 
    private class Keyboard extends KeyAdapter {
 
        public void keyPressed(KeyEvent kEvt) {
            int key = kEvt.getKeyCode();
 
            if ((key == KeyEvent.VK_RIGHT) & s.direction != 2) {
                s.direction = 0;
            }
            if ((key == KeyEvent.VK_DOWN) & s.direction != 3) {
                s.direction = 1;
            }
            if ((key == KeyEvent.VK_LEFT) & s.direction != 0) {
                s.direction = 2;
            }
            if ((key == KeyEvent.VK_UP) & s.direction != 1) {
                s.direction = 3;
            }
        }
    }
/**
 * metoda na vytvoreni menu
 * @param f JFrame
 */
    static void addMenu(JFrame f) {
 
        JMenuBar menuBar = new JMenuBar();
        f.setJMenuBar(menuBar);
 
        JMenuItem leftMenu = new JMenuItem("leftMenu");
        JMenuItem rightMenu = new JMenuItem("rightMenu");
        menuBar.add(leftMenu);
        menuBar.add(rightMenu);
 
        JMenuItem newAction = new JMenuItem("New");
        JMenuItem cutAction = new JMenuItem("Exit");
 
        leftMenu.add(newAction);
        rightMenu.add(cutAction);
 
        newAction.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                
                System.out.println("NEW"); 
            }
 
        });
        cutAction.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                System.out.println("EXIT");
                System.exit(0);
            }
        });
    }
}

package snake1;
 
public class Snake {
    
    Snake1 main;
    
    public int direction = 0;
    public int length = 2;
    
    public int snakeX[] = new int[main.WIDTH*main.HEIGHT];
    public int snakeY[] = new int[main.WIDTH*main.HEIGHT];
 
    public Snake(int x0, int y0, int x1, int y1){
        snakeX[0] = x0;
        snakeY[0] = y0;
        snakeX[1] = x1;
        snakeY[1] = y1;    
    }
    
    public void move() {
                
        for (int d = length; d > 0; d--) {
            snakeX[d] = snakeX[d-1];
            snakeY[d] = snakeY[d-1];
        }
 
        if(direction == 0) snakeX[0]++;
        if(direction == 1) snakeY[0]++;
        if(direction == 2) snakeX[0]--;
        if(direction == 3) snakeY[0]--;
    
        for (int d = length-1; d > 0; d--) {
            if((snakeX[0] == snakeX[d]) & (snakeY[0] == snakeY[d])) length = d-2;
          }
        
        if(snakeX[0] > main.WIDTH) snakeX[0] = 0;
        if(snakeX[0] < 0) snakeX[0] = main.WIDTH-1;
        if(snakeY[0] > main.HEIGHT) snakeY[0] = 0;
        if(snakeY[0] < 0) snakeY[0] = main.HEIGHT-1;
        
        if (length < 2) length = 2;
        
        }
}

package snake1;
 
public class Food {
    
    Snake1 main;
    
    public int posX;
    public int posY;
    
    public Food(int startX, int startY){  // konstruktor
        posX = startX;
        posY = startY;
    }
    
    public void setRandomPosition() {
        posX = (int) (Math.random()*main.WIDTH);
        posY = (int) (Math.random()*main.WIDTH);
    }
}