问如何在Java中向游戏中添加文本

EN

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

public class Gamepanel extends JPanel implements Runnable, KeyListener { 

    private static final long serialVersionUID = 1L;

    public static final int WIDTH = 500, HEIGHT = 500; //window size

    private Thread thread;

    private boolean running; //allows the game to be started/stopped

    private boolean right = true, left = false, up = false, down = false; //setting default movement

    private BodyPart b;
    private ArrayList<BodyPart> snake;

    private Food food;
    private ArrayList<Food> foods;

    private Random r; //creating random integer for food spawn

    private int xCoor = 10, yCoor = 10, size = 5; //setting location and coordinate size, along with snake length
    private int ticks = 0;

    private int points = 0;

    public Gamepanel() {

        setFocusable(true);

        setPreferredSize(new Dimension(WIDTH, HEIGHT)); //window size
        addKeyListener(this); //allows key input from user

        snake = new ArrayList <BodyPart>();
        foods = new ArrayList <Food>();

        r = new Random(); //random integer

    }

    public void start() {
        running = true; //allows the game to start
        thread = new Thread(this);
        thread.start();

    }
    public void stop() {
        running = false; //stops the game from running
        try {
            thread.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    public void tick() {
        if(snake.size() == 0) { //sets location
            b = new BodyPart(xCoor, yCoor, 10);
            snake.add(b);
        }
        ticks++; //constant tick increase
        if(ticks > 750000) { //sets speed (higher = slower)
            if(right) xCoor ++;
            if(left) xCoor --;
            if(up) yCoor --;
            if(down) yCoor ++;

            ticks = 0; 

            b = new BodyPart(xCoor, yCoor, 10);
            snake.add(b);

            if(snake.size() > size) {
                snake.remove(0); //removes earliest value in snake size
            }
        }
        if(foods.size() == 0) { //sets food in window range(multiplies by 10)
            int xCoor = r.nextInt(48);
            int yCoor = r.nextInt(48);

            points++;

            food = new Food(xCoor, yCoor, 10);
            foods.add(food);
        }

        for (int i = 0 ; i < foods.size(); i++) { //spawns new food when old food is eaten
            if(xCoor == foods.get(i).getxCoor() && yCoor == foods.get(i).getyCoor()) {
                size ++;
                foods.remove(i);
                i++;
            }
        }
        //player body collision
        for(int i = 0 ; i < snake.size(); i++) {
            if(xCoor == snake.get(i).getxCoor() && yCoor == snake.get(i).getyCoor()) {
                if(i != snake.size() - 1) {
                    System.out.print("Game Over! " + "Points: " + points);
                    stop();
                }
            }
        }
        //border collision
        if(xCoor < 0 || xCoor > 49 || yCoor < 0 || yCoor > 49) {
            System.out.println("Game Over! " + "Points: " + points);
            stop();
        }

    }
    public void paint(Graphics g) { //background color/size setter

        g.clearRect(0, 0, WIDTH, HEIGHT);

        g.setColor(Color.BLACK); //background color
        g.fillRect(0, 0, WIDTH, HEIGHT);

        for(int i = 0; i < WIDTH/10 ; i++) {
            g.drawLine(i * 10, 0, i * 10, HEIGHT);
        }
        for(int i = 0; i < HEIGHT/10 ; i++) {
            g.drawLine(0, i * 10, HEIGHT, i * 10);
        }
        for(int i = 0 ; i < snake.size(); i++) {
            snake.get(i).draw(g);
        }

        for(int i = 0 ; i < foods.size(); i++) {
            foods.get(i).draw(g);
        }
    }

    @Override
    public void run() {
        while(running) {
            tick(); //runs ticks while running is true
            repaint(); 
        }

    }

    @Override
    public void keyPressed(KeyEvent e) {
        int key = e.getKeyCode();
        if(key == KeyEvent.VK_RIGHT && !left) { //right key = right movement
            right = true;
            up = false;
            down = false;
        }

        if(key == KeyEvent.VK_LEFT && !right) { //left key = left movement
            left = true;
            up = false;
            down = false;
        }

        if(key == KeyEvent.VK_UP && !down) { //up key = up movement 
            up = true;
            right = false;
            left = false;

        }

        if(key == KeyEvent.VK_DOWN && !up) { //down key = down movement
            down = true;
            right = false;
            left = false;

        }

        if(key == KeyEvent.VK_SPACE) {
            snake.clear();
            start();
            size = 5;
            points = 0;
            xCoor = 10;
            yCoor = 10;

        }

    }

    @Override
    public void keyReleased(KeyEvent arg0) {    
    }

    @Override
    public void keyTyped(KeyEvent arg0) {   
    }
}