我一直在从事蛇类游戏，但是我想做的一项改进是在游戏中添加文字，提供说明并跟踪积分。我弄乱了JPanel和其他一些东西，它们都打开了一个新的迷你窗口，该窗口显示文本而不是在主窗口上打印文本。
编辑：
感谢一些有用的人员，我了解正确的用法，但是当我尝试更改颜色时使用它时，它也会更改背景的颜色。我当时以为这是因为它和背景在同一个类中，所以当我将g.setColor放在背景的颜色下时，它进行了更改。
当背景位于paint（）中时，我尝试使用paintComponent（）制作了一个新对象，但文本没有显示出来。
有什么建议吗？
这是主要的Java文件：
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) {
}
}