// Java贪吃蛇游戏源代码
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Random;
public class SnakeGame extends JPanel implements ActionListener {
// 定义游戏的基本参数
private final int SCREEN_WIDTH = 600;
private final int SCREEN_HEIGHT = 600;
private final int UNIT_SIZE = 25;
private final int GAME_UNITS = (SCREEN_WIDTH * SCREEN_HEIGHT) / (UNIT_SIZE * UNIT_SIZE);
private final int DELAY = 75;
private final int x[] = new int[GAME_UNITS];
private final int y[] = new int[GAME_UNITS];
private int bodyParts = 6;
private int applesEaten;
private int appleX;
private int appleY;
private char direction = 'R';
private boolean running = false;
private Timer timer;
private Random random;
public SnakeGame() {
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);
draw(g);
}
public void draw(Graphics g) {
if (running) {
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);
for (int i = 0; i < bodyParts; i++) {
if (i == 0) {
g.setColor(Color.green);
g.fillRect(x[i], y[i], UNIT_SIZE, UNIT_SIZE);
} else {
g.setColor(new Color(45, 180, 0));
g.fillRect(x[i], y[i], UNIT_SIZE, UNIT_SIZE);
}
}
g.setColor(Color.red);
g.setFont(new Font("Ink Free", Font.BOLD, 40));
FontMetrics metrics = getFontMetrics(g.getFont());
g.drawString("Score: " + applesEaten, (SCREEN_WIDTH - metrics.stringWidth("Score: " + applesEaten)) / 2, g.getFont().getSize());
} else {
gameOver(g);
}
}
public void newApple() {
appleX = random.nextInt((int) (SCREEN_WIDTH / UNIT_SIZE)) * UNIT_SIZE;
appleY = random.nextInt((int) (SCREEN_HEIGHT / UNIT_SIZE)) * UNIT_SIZE;
}
public void move() {
for (int i = bodyParts; i > 0; i--) {
x[i] = x[i - 1];
y[i] = y[i - 1];
}
switch (direction) {
case 'U':
y[0] = y[0] - UNIT_SIZE;
break;
case 'D':
y[0] = y[0] + UNIT_SIZE;
break;
case 'L':
x[0] = x[0] - UNIT_SIZE;
break;
case 'R':
x[0] = x[0] + UNIT_SIZE;
break;
}
}
public void checkApple() {
if ((x[0] == appleX) && (y[0] == appleY)) {
bodyParts++;
applesEaten++;
newApple();
}
}
public void checkCollisions() {
// 检查是否撞到自己
for (int i = bodyParts; i > 0; i--) {
if ((x[0] == x[i]) && (y[0] == y[i])) {
running = false;
}
}
// 检查是否撞到墙壁
if (x[0] < 0 || x[0] >= SCREEN_WIDTH || y[0] < 0 || y[0] >= SCREEN_HEIGHT) {
running = false;
}
if (!running) {
timer.stop();
}
}
public void gameOver(Graphics g) {
// 显示游戏结束信息
g.setColor(Color.red);
g.setFont(new Font("Ink Free", Font.BOLD, 75));
FontMetrics metrics1 = getFontMetrics(g.getFont());
g.drawString("Game Over", (SCREEN_WIDTH - metrics1.stringWidth("Game Over")) / 2, SCREEN_HEIGHT / 2);
g.setColor(Color.red);
g.setFont(new Font("Ink Free", Font.BOLD, 40));
FontMetrics metrics2 = getFontMetrics(g.getFont());
g.drawString("Score: " + applesEaten, (SCREEN_WIDTH - metrics2.stringWidth("Score: " + applesEaten)) / 2, g.getFont().getSize());
}
@Override
public void actionPerformed(ActionEvent e) {
if (running) {
move();
checkApple();
checkCollisions();
}
repaint();
}
public class MyKeyAdapter extends KeyAdapter {
@Override
public void keyPressed(KeyEvent e) {
switch (e.getKeyCode()) {
case KeyEvent.VK_LEFT:
if (direction != 'R') {
direction = 'L';
}
break;
case KeyEvent.VK_RIGHT:
if (direction != 'L') {
direction = 'R';
}
break;
case KeyEvent.VK_UP:
if (direction != 'D') {
direction = 'U';
}
break;
case KeyEvent.VK_DOWN:
if (direction != 'U') {
direction = 'D';
}
break;
}
}
}
public static void main(String[] args) {
JFrame frame = new JFrame("Snake Game");
SnakeGame gamePanel = new SnakeGame();
frame.add(gamePanel);
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
类和方法结构:
SnakeGame
类继承了 JPanel
并实现了 ActionListener
接口。startGame()
方法初始化游戏,生成苹果并启动计时器。paintComponent()
方法负责绘制游戏界面。newApple()
方法随机生成一个新的苹果位置。move()
方法更新蛇的位置。checkApple()
方法检查蛇是否吃到苹果。checkCollisions()
方法检查蛇是否撞到自己或墙壁。gameOver()
方法处理游戏结束的显示逻辑。actionPerformed()
方法每帧调用一次,更新游戏状态并重绘界面。MyKeyAdapter
内部类用于监听键盘事件以改变蛇的方向。关键变量:
x[]
和 y[]
数组存储蛇的身体坐标。bodyParts
记录蛇的长度。applesEaten
记录吃掉的苹果数量。appleX
和 appleY
存储苹果的位置。direction
记录当前移动方向。running
标志游戏是否正在运行。主函数:
main()
方法创建并启动游戏窗口。这个代码实现了一个简单的贪吃蛇游戏,玩家可以通过键盘方向键控制蛇的移动。当蛇吃到苹果时会变长,并且会在撞到墙壁或自身时游戏结束。
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