Problem with white lines not visible

[knotty lodge]

any suggets how fix?
with red dot is someone else
without red dot mine bugged or did wrong mapping? i think it's outside JRE how can file put inside JRE and it's VSCode software

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import java.util.Random;


public class GamePanel extends JPanel implements ActionListener{

    static final int SCREEN_WIDTH = 600;
    static final int SCREEN_HEIGHT = 600;
    static final int UNIT_SIZE = 25;
    static final int GAME_UNITS = (SCREEN_WIDTH*SCREEN_HEIGHT)/UNIT_SIZE;
    static final int DELAY = 75;
     final int x[] = new int[GAME_UNITS];
     final int y[] = new int[GAME_UNITS];
     int bodyParts = 6;
     int appleEaten;
     int appleX;
     int appleY;
     char direction = 'R';
     boolean running = false;
     Timer timer;
     Random random;

    GamePanel(){       
        random = new Random();
        this.setPreferredSize(new Dimension(SCREEN_WIDTH,SCREEN_HEIGHT));
        this.setBackground(Color.BLACK);
        this.setFocusable(true);
        this.addKeyListener(new MyKeyAdapter());
        startGame();
    }    
    public void startGame(){
        newApple();
        running = true;
        timer = new Timer(DELAY,this);
        timer.start();
    }
    public void paintComponent(Graphics g){
        super.paintComponent(g);
    }
    public void draw(Graphics g){
        for(int i=0;i<SCREEN_HEIGHT/UNIT_SIZE;i++){

            g.drawLine(i*UNIT_SIZE, 0, i*UNIT_SIZE, SCREEN_HEIGHT);
            g.drawLine(0, i*UNIT_SIZE, SCREEN_WIDTH, i*UNIT_SIZE);
        }
        g.setColor(Color.red);
        g.fillOval(appleX, appleY, UNIT_SIZE, UNIT_SIZE);
    }
    public void newApple(){
        appleX = random.nextInt((int)(SCREEN_WIDTH/UNIT_SIZE))*UNIT_SIZE;
        appleY = random.nextInt((int)(SCREEN_HEIGHT/UNIT_SIZE))*UNIT_SIZE;
    }```

[rough creek]

⌛ This post has been reserved for your question.

Hey @knotty lodge! Please use /close or the Close Post button above when your problem is solved. Please remember to follow the help guidelines. This post will be automatically closed after 300 minutes of inactivity.

TIP: Narrow down your issue to simple and precise questions to maximize the chance that others will reply in here.

[knotty lodge]

right one black fill without lines is mine not visible at all O.o

[granite merlin]

you are not calling your draw method in paintComponent

[knotty lodge]

Ooh okay thanks

[rough creek]

If you are finished with your post, please close it.
If you are not, please ignore this message.
Note that you will not be able to send further messages here after this post have been closed but you will be able to create new posts.