50行java小游戏源代码

以下是一个简单的 Java 小游戏代码，可以帮助您入门游戏开发。

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Random;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Game extends JPanel implements KeyListener {
    private static final long serialVersionUID = 1L;

    private int x = 0;
    private int y = 0;
    private int score = 0;
    private int speed = 5;
    private int blockSize = 10;
    private int width = 400;
    private int height = 400;
    private boolean gameOver = false;
    private Random random = new Random();

    private int[] dx = {0, 0, -1, 1};
    private int[] dy = {-1, 1, 0, 0};
    private int direction = 1;

    private int foodX = random.nextInt(width / blockSize) * blockSize;
    private int foodY = random.nextInt(height / blockSize) * blockSize;

    public Game() {
        JFrame frame = new JFrame("Snake Game");
        frame.setSize(width, height);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.addKeyListener(this);
        frame.add(this);
        setFocusable(true);
        setFocusTraversalKeysEnabled(false);
    }

    public void paint(Graphics g) {
        super.paint(g);

        if (gameOver) {
            g.setColor(Color.RED);
            g.drawString("Game Over", width / 2 - 30, height / 2);
            g.drawString("Score: " + score, width / 2 - 30, height / 2 + 20);
            return;
        }

        g.setColor(Color.BLACK);
        g.fillRect(x, y, blockSize, blockSize);
        g.setColor(Color.GREEN);
        g.fillRect(foodX, foodY, blockSize, blockSize);
    }

    public void keyPressed(KeyEvent e) {
        int keyCode = e.getKeyCode();

        if (keyCode == KeyEvent.VK_UP && direction != 1) {
            direction = 0;
        }

        if (keyCode == KeyEvent.VK_DOWN && direction != 0) {
            direction = 1;
        }

        if (keyCode == KeyEvent.VK_LEFT && direction != 3) {
            direction = 2;
        }

        if (keyCode == KeyEvent.VK_RIGHT && direction != 2) {
            direction = 3;
        }
    }

    public void keyReleased(KeyEvent e) {
    }

    public void keyTyped(KeyEvent e) {
    }

    public void move() {
        x += dx[direction] * blockSize;
        y += dy[direction] * blockSize;

        if (x < 0 || x >= width || y < 0 || y >= height) {
            gameOver = true;
        }

        if (x == foodX && y == foodY) {
            score++;
            foodX = random.nextInt(width / blockSize) * blockSize;
            foodY = random.nextInt(height / blockSize) * blockSize;
        }
    }

    public void run() {
        while (!gameOver) {
            move();
            repaint();

            try {
                Thread.sleep(speed);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        Game game = new Game();
        game.run();
    }
}

这个游戏是一个简单的贪吃蛇游戏，玩家通过控制蛇的方向来吃到食物，每吃一个食物得分一分，游戏结束条件是撞墙或者撞到自己的身体。